def keithOutMethod(val):
keith = Keithley2400(f)
if val == 'ON':
keith.outputOn()
else:
keith.outputOff()
def quitMethod():
amp = lockinAmp(func, sense, signal, freq)
amp.dacOutput(0, 1)
amp.dacOutput(0, 2)
amp.dacOutput(0, 3)
amp.dacOutput(0, 4)
keith=Keithley2400(f)
keith.setCurrent(0)
keith.outputOff()
listbox_l.insert('end', "All fields set to zero.")
listbox_l.see(END)
global root
root.quit()
def event():
current_start=float(_current)
current_end=float(_current)*(-1)
current_step=float(_step)
keith=Keithley2400(f) #Initiate K2400
while current_start>=current_end:
ax.clear()
ax.grid(True)
ax.set_title("Realtime Hall voltage vs H Plot")
ax.set_xlabel("Applied Field (Oe)")
ax.set_ylabel("Lock-In X (mV)")
#Prepare data entries
global values_x, values_y, result
values_y=[]
values_x=[]
result=[]
#Setup K2400 for current output and resistance measurement
keith.setCurrent(current_start)
keith.outputOn()
index=1
data=[]
while index<=5: #Average of five measurements
data=data+keith.measureOnce()
index+=1
print("Measured current: %f mA" %(1000*data[2]))
print("Measured voltage: %f V" %data[1])
print("Measured resistance: %f Ohm" %(data[1]/data[2]))
#Setup lock-in for dac output
t=0
a=0.0
amp = lockinAmp(func, sense, signal, freq)
step = (double(_output)/i)/n
while t < n :
amp.dacOutput(a, DAC)
tmp=1000*double(amp.readX(average)) #in units of mV
result.append(tmp)
values_y.append(tmp)
values_x.append(a*i)
ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
t+=1
a+=step
listbox_l.see(END)
while t < 3*n :
amp.dacOutput(a, DAC)
tmp=1000*double(amp.readX(average))
result.append(tmp)
values_y.append(tmp)
values_x.append(a*i)
ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
t+=1
a-=step
listbox_l.see(END)
while t <= 4*n :
amp.dacOutput(a, DAC)
tmp=1000*double(amp.readX(average))
result.append(tmp)
values_y.append(tmp)
values_x.append(a*i)
ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
t+=1
a+=step
listbox_l.see(END)
#scat=ax.scatter(values_x, values_y, s=50, alpha=0.5)
#canvas.draw()
keith.outputOff()
current_start=current_start-current_step
time.sleep(1) #Sleep between each scan
listbox_l.insert('end',"Measurement finished")
listbox_l.see(END)
def event():
Hx_start = float(_Hx)
Hx_end = float(_Hx) * (-1)
Hx_step = float(_dHx)
keith = Keithley2400(f) #Initiate K2400
keith2000 = Keithley(f) #Initiate K2000
amp = lockinAmp(func, sense, signal, freq) #Initiate Lock-in
while Hx_start >= Hx_end:
amp.dacOutput((Hx_start / ix), DACx)
current_max = float(_current)
current_min = float(_current) * (-1)
current_step = float(_step)
#while current_start>=current_end:
ax.clear()
ax.grid(True)
ax.set_title("Realtime Resistance vs I Plot")
ax.set_xlabel("Applied Current (mA)")
ax.set_ylabel("Hall Resistance (Ohm)")
listbox_l.insert('end',
"Now measuring with Hx = %f (Oe)" % Hx_start)
listbox_l.see(END)
#Prepare data entries
global values_x, values_y, result
values_y = []
values_x = []
result = []
#Setup K2400 for current output and resistance measurement
keith.fourWireOff()
keith.setCurrent(0.1) #Use 0.1mA to measure DC resistance
keith.outputOn()
index = 1
data = []
while index <= 5: #Average of five measurements
data = data + keith.measureOnce()
index += 1
print("Measured current: %f mA" % (1000 * data[2]))
print("Measured voltage: %f V" % data[1])
print("Measured resistance: %f Ohm" % (data[1] / data[2]))
keith.outputOff()
#Setup Keithley for Idc sweep
current = 0 #starting current amplitude
current_sense = 0.01 #sensing current amplitude 0.1mA
#Pulse train parameters
write_pulse_width = 0.05
read_pulse_width = 0.05
write_read_pause = 0.05
period = 0.05
keith.outputOn()
while current < current_max:
#keith.outputOn()
keith.setCurrent(current) # Set switching current
time.sleep(write_pulse_width)
keith.setCurrent(0) # Reduce current amplitude to zero
#keith.outputOff()
time.sleep(write_read_pause)
#keith.outputOn()
keith.setCurrent(current_sense) # Set sensing current to 0.1mA
time.sleep(read_pulse_width)
data = keith2000.measureOnce()
keith.setCurrent(0) # Reduce current amplitude to zero
#keith.outputOff()
tmp = double(1000 * data[1] /
current_sense) # Voltage from K2000 / 0.1mA
result.append(tmp)
values_y.append(tmp)
values_x.append(current)
#ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
ax.plot(values_x,
values_y,
'b-o',
ms=dot_size,
mew=dot_edge,
alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
current += current_step
listbox_l.see(END)
time.sleep(period)
while current > current_min:
#keith.outputOn()
keith.setCurrent(current) # Set switching current
time.sleep(write_pulse_width)
keith.setCurrent(0) # Reduce current amplitude to zero
#keith.outputOff()
time.sleep(write_read_pause)
#keith.outputOn()
keith.setCurrent(current_sense) # Set sensing current to 0.1mA
time.sleep(read_pulse_width)
data = keith2000.measureOnce()
keith.setCurrent(0) # Reduce current amplitude to zero
#keith.outputOff()
tmp = double(1000 * data[1] /
current_sense) # Voltage from K2000 / 0.1mA
result.append(tmp)
values_y.append(tmp)
values_x.append(current)
#ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
ax.plot(values_x,
values_y,
'b-o',
ms=dot_size,
mew=dot_edge,
alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
current -= current_step
listbox_l.see(END)
time.sleep(period)
while current <= 0:
#keith.outputOn()
keith.setCurrent(current) # Set switching current
time.sleep(write_pulse_width)
keith.setCurrent(0) # Reduce current amplitude to zero
#keith.outputOff()
time.sleep(write_read_pause)
#keith.outputOn()
keith.setCurrent(current_sense) # Set sensing current to 0.1mA
time.sleep(read_pulse_width)
data = keith2000.measureOnce()
keith.setCurrent(0) # Reduce current amplitude to zero
#keith.outputOff()
tmp = double(1000 * data[1] /
current_sense) # Voltage from K2000 / 0.1mA
result.append(tmp)
values_y.append(tmp)
values_x.append(current)
#ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
ax.plot(values_x,
values_y,
'b-o',
ms=dot_size,
mew=dot_edge,
alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
current += current_step
listbox_l.see(END)
time.sleep(period)
#scat=ax.scatter(values_x, values_y, s=50, alpha=0.5)
#canvas.draw()
stamp = datetime.now().strftime('%Y-%m-%d-%H%M%S')
listbox_l.insert('end', str(stamp))
file = open(
str(directory) + "/MR_STT_switching_" + str(Hx_start) + "Oe_" +
str(stamp), "w")
file.write("Applied in-plane field: " + str(Hx_start) + "(Oe)\n\n")
file.write("Number" + " " + "Current(mA)" + " " +
"Resistance(Ohm)" + "\n")
cnt = 1
#output all data
for a in range(len(values_y)):
file.write(
str(cnt) + " " + str(values_x[a]) + " " +
str(values_y[a]) + "\n")
cnt += 1
file.closed
listbox_l.insert('end', "The Measurement data is saved.")
listbox_l.see(END)
#keith.outputOff()
time.sleep(1) #Sleep between each scan
Hx_start = Hx_start - Hx_step
amp.dacOutput(0, DACx)
amp.dacOutput(0, DAC)
keith.fourWireOff()
keith.outputOff()
listbox_l.insert('end', "Measurement finished")
listbox_l.see(END)
def event():
Hx_start=float(_Hx)
Hx_end=float(_Hx)*(-1)
Hx_step=float(_dHx)
keith=Keithley2400(f) #Initiate K2400
amp = lockinAmp(func, sense, signal, freq) #Initiate Lock-in
while Hx_start>=Hx_end:
amp.dacOutput((Hx_start/ix), DACx)
current_start=float(_current)
current_end=float(_current)*(-1)
current_step=float(_step)
while current_start>=current_end:
ax.clear()
ax.grid(True)
ax.set_title("Realtime MOKE signal vs H Plot")
ax.set_xlabel("Applied Field (Oe)")
ax.set_ylabel("MOKE signal (R+G+B)")
listbox_l.insert('end',"Now measuring with Hx = %f (Oe) and Idc = %f (mA) " %(Hx_start,current_start))
listbox_l.see(END)
#Prepare data entries
global values_x, values_y, result
values_y=[]
values_x=[]
result=[]
#Setup K2400 for current output and resistance measurement
keith.setCurrent(current_start)
keith.outputOn()
index=1
data=[]
while index<=5: #Average of five measurements
data=data+keith.measureOnce()
index+=1
print("Measured current: %f mA" %(1000*data[2]))
print("Measured voltage: %f V" %data[1])
print("Measured resistance: %f Ohm" %(data[1]/data[2]))
#Setup lock-in for dac (Hz field) output
t=0
a=0.0
step = (double(_output)/i)/n
while t < n :
amp.dacOutput(a, DAC)
tmp=imageMethod(x1,y1,x2,y2) #get image lumi
result.append(tmp)
values_y.append(tmp)
values_x.append(a*i)
ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
t+=1
a+=step
listbox_l.see(END)
while t < 3*n :
amp.dacOutput(a, DAC)
tmp=imageMethod(x1,y1,x2,y2) #get image lumi
result.append(tmp)
values_y.append(tmp)
values_x.append(a*i)
ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
t+=1
a-=step
listbox_l.see(END)
while t <= 4*n :
amp.dacOutput(a, DAC)
tmp=imageMethod(x1,y1,x2,y2) #get image lumi
result.append(tmp)
values_y.append(tmp)
values_x.append(a*i)
ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
t+=1
a+=step
listbox_l.see(END)
#scat=ax.scatter(values_x, values_y, s=50, alpha=0.5)
#canvas.draw()
file = open(str(directory)+"/sample_name_"+str(Hx_start)+"Oe_"+str(current_start)+"mA", "w")
file.write("Applied in-plane field: "+str(Hx_start)+"(Oe)\n")
file.write("Applied current: "+str(current_start)+"(mA)\n\n")
file.write("Number"+" "+"Field(Oe)"+" "+"Voltage(mV)"+"\n")
cnt=1
#output all data
for a in range(len(values_y)):
file.write(str(cnt)+" "+str(values_x[a])+" "+str(values_y[a])+"\n")
cnt +=1
file.closed
listbox_l.insert('end', "The Measurement data is saved.")
listbox_l.see(END)
keith.outputOff()
current_start=current_start-current_step
time.sleep(1) #Sleep between each scan
Hx_start=Hx_start-Hx_step
amp.dacOutput(0, DACx)
amp.dacOutput(0, DAC)
listbox_l.insert('end',"Measurement finished")
listbox_l.see(END)
def measureMethod(_inteval, _number, _output, _average, _signal, _frequency,
_current):
global values_x, values_y, result
values_y = []
values_x = []
result = []
i = float(_inteval)
n = int(_number)
average = int(_average)
signal = float(_signal)
freq = int(_frequency)
current = float(_current)
#Setup Keithley2400 for current output and resistance measurement
keith = Keithley2400(f)
keith.setCurrent(current)
keith.outputOn()
index = 1
data = []
while index <= 5: #Average of five measurements
data = data + keith.measureOnce()
index += 1
print("Measured current: %f mA" % (1000 * data[2]))
print("Measured voltage: %f V" % data[1])
print("Measured resistance: %f Ohm" % (data[1] / data[2]))
ax.clear()
ax.grid(True)
ax.set_title("Realtime Hall voltage vs H Plot")
ax.set_xlabel("Applied Field (Oe)")
ax.set_ylabel("Lock-In X (mV)")
#ax.axis([0, i*n, -10, 10])
def event():
t = 0
a = 0.0
amp = lockinAmp(func, sense, signal, freq)
step = (double(_output) / i) / n
while t < n:
amp.dacOutput(a, DAC)
tmp = 1000 * double(amp.readX(average)) #in units of mV
result.append(tmp)
values_y.append(tmp)
values_x.append(a * i)
ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
t += 1
a += step
listbox_l.see(END)
while t < 3 * n:
amp.dacOutput(a, DAC)
tmp = 1000 * double(amp.readX(average))
result.append(tmp)
values_y.append(tmp)
values_x.append(a * i)
ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
t += 1
a -= step
listbox_l.see(END)
while t <= 4 * n:
amp.dacOutput(a, DAC)
tmp = 1000 * double(amp.readX(average))
result.append(tmp)
values_y.append(tmp)
values_x.append(a * i)
ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
t += 1
a += step
listbox_l.see(END)
#scat=ax.scatter(values_x, values_y, s=50, alpha=0.5)
#canvas.draw()
keith.outputOff()
listbox_l.insert('end', "Measurement finished")
listbox_l.see(END)
th = threading.Thread(target=event)
th.start()
def event():
keith = Keithley2400(f) #Initiate K2400
keith2000 = Keithley(f) #Initiate K2000
writetask = nidaqmx.Task() #Initiate GMW write & read channels
readtask = nidaqmx.Task()
Va_applied = writetask.ao_channels.add_ao_voltage_chan(
"VectorMagnet/ao0")
Vb_applied = writetask.ao_channels.add_ao_voltage_chan(
"VectorMagnet/ao1")
Vc_applied = writetask.ao_channels.add_ao_voltage_chan(
"VectorMagnet/ao2")
Field_X = readtask.ai_channels.add_ai_voltage_chan("VectorMagnet/ai0")
Field_Y = readtask.ai_channels.add_ai_voltage_chan("VectorMagnet/ai1")
Field_Z = readtask.ai_channels.add_ai_voltage_chan("VectorMagnet/ai2")
#readtask.read() will give [V_ai0, V_ai1, V_ai2]
Hin_start = float(_Hin)
Hin_end = float(_Hin) * (-1)
Hin_step = float(_dHin) # step value of Hx field
if Hin_start < 0:
Hin_mod = -1 #allows for loop to run from negative to positive Hx values
Hin_start = Hin_end #initialize Hx start to be a positive number
Hin_end = Hin_start * (-1) #makes Hx end a negative number
else:
Hin_mod = 1
while Hin_start >= Hin_end:
current_start = float(_current)
current_end = float(_current) * (-1)
current_step = float(_step)
while current_start >= current_end:
ax.clear()
ax.grid(True)
ax.set_title("Realtime Resistance vs Theta Plot")
#ax.set_xlabel("Applied Field Angle (Theta)")
#ax.set_ylabel("Hall Resistance (Ohm)")
listbox_l.insert(
'end',
"Now measuring with Idc = %f (mA) " % (current_start))
listbox_l.see(END)
#Prepare data entries
global values_x, values_y, result, canvas
values_y = []
values_x = []
result = []
#Setup K2400 for current output and resistance measurement
keith.fourWireOff()
keith.setCurrent(current_start)
keith.outputOn()
index = 1
data = []
m_time = []
m_xfield = []
m_yfield = []
m_zfield = []
m_fieldang = []
# for plot data (angle unit: rad)
rad_values_x = []
rad_m_fieldang = []
while index <= 5: #Average of five measurements
data = data + keith.measureOnce()
index += 1
listbox_l.insert('end',
"Measured current: %f mA" % (1000 * data[2]))
listbox_l.insert('end', "Measured voltage: %f V" % data[1])
listbox_l.insert(
'end', "Measured resistance: %f Ohm" % (data[1] / data[2]))
listbox_l.see(END)
resistance = data[1] / data[2]
writetask.write([0, 0, 0])
#initial application of field to avoid outliers
j = Hin_start / i
for g in range(0, len(angmagV)):
writetask.write([x * j for x in angmagV[g]])
start = time.time()
data = keith2000.measureMulti(average)
fdata = [
0, 0, 0
] # origin measured field is in unit V, ifield is conversion value with unit Oe/V
findex = 1
while findex <= 5: #Average of five measurements
fdata = [
fdata[i] + readtask.read()[i] for i in range(0, 3)
]
findex += 1
fielddata = [x * ifield / 5 for x in fdata
] #while loop is for averaging 5 measurements
fieldang = np.arctan(
fielddata[ychan] / fielddata[xchan]) / np.pi * 180
# store data in lists for later writecsv process
m_zfield.append(fielddata[zchan])
m_xfield.append(fielddata[xchan])
m_yfield.append(fielddata[ychan])
m_fieldang.append(fieldang)
rad_m_fieldang.append(fieldang / 180 * np.pi)
tmp = double(
1000 * data / current_start
) # Voltage from K2000 / Current from K2400 (Hall resistance)
result.append(tmp)
values_y.append(tmp)
values_x.append(ang[g])
rad_values_x.append(ang[g] / 180 * np.pi)
#ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
mid = time.time()
ax.plot(rad_values_x,
values_y,
'b-o',
ms=dot_size,
mew=dot_edge,
alpha=0.5)
#ax.plot(rad_m_fieldang, values_y,'r-o', ms=dot_size, mew=dot_edge, alpha=0.5)
canvas.draw()
listbox_l.insert(
'end', "Hall Resistance:" + str(round(tmp, 4)) +
" Applied Field Angle:" + str(round(ang[g], 4)) +
" Measured Field Angle:" + str(round(fieldang, 4)))
listbox_l.see(END)
fin = time.time()
m_time.append(fin - start)
#print('Total Time: ', (fin-start), '\n Plot time: ', (fin-mid))
print("Applied Field Angle: " + str(round(ang[g], 4)))
'''
while t < 2*n : #------------------------------------------------------------------------------------------------------- 時間設定應該會出問題-
writetask.write([a,a,a])
#sleep at start to avoid outliers
if t < 5:
time.sleep(.5)
start = time.time()
data=keith2000.measureMulti(average)
fdata=[] # origin measured field is in unit V, ifield is conversion value with unit Oe/V
findex=1
while findex<=5: #Average of five measurements
fdata=[fdata[i]+readtask.read()[i] for i in range(0,3)]
findex+=1
fielddata=[x*ifield/5 for x in fdata] #while loop is for averaging 5 measurements
m_zfield.append(fielddata[zchan])
m_xfield.append(fielddata[xchan])
m_yfield.append(fielddata[ychan])
tmp=double(1000*data/current_start) # Voltage from K2000 / Current from K2400 (Hall resistance)
result.append(tmp)
values_y.append(tmp)
values_x.append(a*i)
#ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
mid = time.time()
ax.plot(values_x, values_y,'b-o', ms=dot_size, mew=dot_edge, alpha=0.5)
canvas.draw()
listbox_l.insert('end', "Hall Resistance:" + str(round(tmp,4)) + " Applied Field:" + str(round(a*i,4)) + " Measured Field:" + str(round(fielddata[zchan],4)))
t+=1
a+=step
listbox_l.see(END)
fin = time.time()
m_time.append(fin-start)
print('Total Time: ', (fin-start), '\n Plot time: ', (fin-mid))
while t <= 4*n :
start = time.time()
writetask.write([a,a,a])
data=keith2000.measureMulti(average)
fdata=[] # origin measured field is in unit V, ifield is conversion value with unit Oe/V
findex=1
while findex<=5: #Average of five measurements
fdata=[fdata[i]+readtask.read()[i] for i in range(0,3)]
findex+=1
fielddata=[x*ifield/5 for x in fdata] #while loop is for averaging 5 measurements
m_zfield.append(fielddata[zchan])
m_xfield.append(fielddata[xchan])
m_yfield.append(fielddata[ychan])
tmp=double(1000*data/current_start) # Voltage from K2000 / Current from K2400
result.append(tmp)
values_y.append(tmp)
values_x.append(a*i)
mid = time.time()
#ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
ax.plot(values_x, values_y,'b-o', ms=dot_size, mew=dot_edge, alpha=0.5)
canvas.draw()
listbox_l.insert('end', "Hall Resistance:" + str(round(tmp,4)) + " Applied Field:" + str(round(a*i,4)) + " Measured Field:" + str(round(fielddata[zchan],4)))
t+=1
a-=step
listbox_l.see(END)
fin = time.time()
m_time.append(fin-start)
print('Total Time: ', (fin-start), '\n Plot time: ', (fin-mid))
'''
#Setup timestamp
stamp = datetime.now().strftime('%Y-%m-%d-%H%M%S')
listbox_l.insert('end', str(stamp))
file = open(
str(directory) + "/" + str(_sample) + "GMW_AMR_" +
str(round(resistance, 2)) + "Ohm_" +
str(round(current_start, 2)) + "mA_" + str(stamp), "w")
file.write("Sample name: " + str(_sample) + "\n")
file.write("Applied current: " + str(current_start) +
"(mA)\n\n")
file.write("Number" + " " + "Applied Field Angle" + " " +
"Resistance(Ohm)" + " " + "Measure_time" + " " +
"Measured Field Angle" + " " +
"Measured XField(Oe)" + " " +
"Measured YField(Oe)" + " " +
"Measured ZField(Oe)" + "\n")
cnt = 1
#output all data
for a in range(len(values_y)):
file.write(
str(cnt) + " " + str(values_x[a]) + " " +
str(values_y[a]) + " " + str(m_time[a]) + " " +
str(m_fieldang[a]) + " " + str(m_xfield[a]) + " " +
str(m_yfield[a]) + " " + str(m_zfield[a]) + "\n")
cnt += 1
file.closed
listbox_l.insert('end', "The Measurement data is saved.")
listbox_l.see(END)
#keith.outputOff()
current_start = current_start - current_step
time.sleep(1) #Sleep between each scan
Hin_start = Hin_start - Hin_step
writetask.write([0, 0, 0])
writetask.close()
readtask.close()
keith.fourWireOff()
keith.outputOn()
listbox_l.insert('end', "Measurement finished")
listbox_l.see(END)
def event():
Hx_start = float(_Hx) # Max Hx field value
Hx_end = float(_Hx) * (-1) # Min Hx field value
Hx_step = float(_dHx) # step in Hx field
keith = Keithley2400(f) #Initiate K2400
amp = lockinAmp(func, sense, signal, freq) #Initiate Lock-in
while Hx_start >= Hx_end:
amp.dacOutput((Hx_start / ix), DACx)
current_start = float(
_current) # Max current set by Keithley 2400
current_end = float(_current) * (
-1) # Min current set by Keithley 2400
current_step = float(_step) # step in current
while current_start >= current_end:
ax.clear()
ax.grid(True)
ax.set_title("Realtime Hall voltage vs H Plot")
ax.set_xlabel("Applied Field (Oe)")
ax.set_ylabel("Lock-In X (mV)")
listbox_l.insert(
'end',
"Now measuring with Hx = %f (Oe) and Idc = %f (mA) " %
(Hx_start, current_start))
listbox_l.see(END)
#Prepare data entries
global values_x, values_y, result
values_y = []
values_x = []
result = []
#Setup K2400 for current output and resistance measurement
keith.setCurrent(current_start)
keith.outputOn()
index = 1
data = []
while index <= 5: #Average of five measurements
data = data + keith.measureOnce()
index += 1
print("Measured current: %f mA" % (1000 * data[2]))
print("Measured voltage: %f V" % data[1])
print("Measured resistance: %f Ohm" % (data[1] / data[2]))
save = (data[1] / data[2])
#Setup lock-in for dac (Hz field) output
t = 0
a = 0.0
step = (double(_output) / i) / n
while t < n:
amp.dacOutput(a, DAC)
tmp = 1000 * double(amp.readX(average)) #in units of mV
result.append(tmp)
values_y.append(tmp)
values_x.append(a * i)
ax.plot(values_x,
values_y,
'b-o',
ms=dot_size,
mew=dot_edge,
alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
t += 1
a += step
listbox_l.see(END)
while t < 3 * n:
amp.dacOutput(a, DAC)
tmp = 1000 * double(amp.readX(average))
result.append(tmp)
values_y.append(tmp)
values_x.append(a * i)
ax.plot(values_x,
values_y,
'b-o',
ms=dot_size,
mew=dot_edge,
alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
t += 1
a -= step
listbox_l.see(END)
while t <= 4 * n:
amp.dacOutput(a, DAC)
tmp = 1000 * double(amp.readX(average))
result.append(tmp)
values_y.append(tmp)
values_x.append(a * i)
ax.plot(values_x,
values_y,
'b-o',
ms=dot_size,
mew=dot_edge,
alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
t += 1
a += step
listbox_l.see(END)
#Setup timestamp
stamp = datetime.now().strftime('%Y-%m-%d-%H%M%S')
listbox_l.insert('end', str(stamp))
file = open(
str(directory) + "/" + str(_sample) + "_" + str(save) +
"Ohm_" + str(Hx_start) + "Oe_" + str(current_start) +
"mA_" + str(stamp), "w")
file.write("" + str(_sample) + "\n")
file.write("Initial resistance: " + str(save) + "(Ohm)\n")
file.write("Applied in-plane field: " + str(Hx_start) +
"(Oe)\n")
file.write("Applied current: " + str(current_start) +
"(mA)\n\n")
file.write("Number" + " " + "Field(Oe)" + " " + "Voltage(mV)" +
"\n")
cnt = 1
#output all data
for a in range(len(values_y)):
file.write(
str(cnt) + " " + str(values_x[a]) + " " +
str(values_y[a]) + "\n")
cnt += 1
file.closed
listbox_l.insert('end', "The Measurement data is saved.")
listbox_l.see(END)
keith.outputOff()
current_start = current_start - current_step
time.sleep(1) #Sleep between each scan
Hx_start = Hx_start - Hx_step
amp.dacOutput(0, DACx)
amp.dacOutput(0, DAC)
listbox_l.insert('end', "Measurement finished")
listbox_l.see(END)
def event():
Hx_start = float(_Hx) # Max Hx field strength
Hx_end = float(_Hx) * (-1) # Min Hx field strength
Hx_step = float(_dHx) # step in Hx field per loop
keith = Keithley2400('CURR') #Initiate K2400
amp = lockinAmp(func, sense, signal, freq) #Initiate Lock-in
while Hx_start >= Hx_end:
amp.dacOutput((Hx_start / ix), DACx)
current_max = float(
_current) # max current applied by Keithley 2400
current_min = float(_current) * (
-1) # min current applied by Keithley 2400
current_step = float(_step) # current step per loop
ax.clear()
ax.grid(True)
ax.set_title("Realtime MOKE signal vs I Plot")
ax.set_xlabel("Applied Current (mA)")
ax.set_ylabel("MOKE signal (R+G+B)")
ax.set_title("Realtime Hall voltage vs I Plot")
ax.set_xlabel("Applied Current (mA)")
ax.set_ylabel("Lock-In X (mV)")
listbox_l.insert('end',
"Now measuring with Hx = %f (Oe)" % Hx_start)
listbox_l.see(END)
#Prepare data entries
global values_x, values_y, result
values_y = []
values_x = []
result = []
#Setup K2400 for current output and resistance measurement
keith.setCurrent(0.1) #Use 0.1mA to measure DC resistance
keith.outputOn()
index = 1
data = []
while index <= 5: #Average of five measurements
data = data + keith.measureOnce()
index += 1
print("Measured current: %f mA" % (1000 * data[2]))
print("Measured voltage: %f V" % data[1])
print("Measured resistance: %f Ohm" % (data[1] / data[2]))
save = (data[1] / data[2])
#Setup Keithley for Idc sweep
current = 0
trigger_delay = float(_rest_length)
source_delay = float(_pulse_length)
while current < current_max:
keith.pulse(current, current_max, trigger_delay, source_delay)
tmp = imageMethod(x1, y1, x2, y2) #get image lumi
result.append(tmp)
values_y.append(tmp)
values_x.append(current)
ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
current += current_step
listbox_l.see(END)
while current > -current_max:
keith.pulse(current, current_max, trigger_delay, source_delay)
tmp = imageMethod(x1, y1, x2, y2) #get image lumi
result.append(tmp)
values_y.append(tmp)
values_x.append(current)
ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
current -= current_step
listbox_l.see(END)
while current <= 0:
keith.pulse(current, current_max, trigger_delay, source_delay)
tmp = imageMethod(x1, y1, x2, y2) #get image lumi
result.append(tmp)
values_y.append(tmp)
values_x.append(current)
ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
current += current_step
listbox_l.see(END)
stamp = datetime.now().strftime('%Y-%m-%d-%H%M%S')
file = open(
str(directory) + "/" + str(_sample) + "_pulse_switching" +
str(Hx_start) + "Oe" + "_" + str(stamp), "w")
file.write(str(_sample) + "\n")
file.write("Initial resistance: " + str(save) + "(Ohm)\n")
file.write("Applied in-plane field: " + str(Hx_start) + "(Oe)\n\n")
file.write("Number" + " " + "Field(Oe)" + " " +
"MOKE signal(RGB)" + "\n")
cnt = 1
#output all data
for a in range(len(values_y)):
file.write(
str(cnt) + " " + str(values_x[a]) + " " +
str(values_y[a]) + "\n")
cnt += 1
file.closed
listbox_l.insert('end', "The Measurement data is saved.")
listbox_l.see(END)
keith.outputOff()
time.sleep(1) #Sleep between each scan
Hx_start = Hx_start - Hx_step
amp.dacOutput(0, DACx)
amp.dacOutput(0, DAC)
listbox_l.insert('end', "Measurement finished")
listbox_l.see(END)
def event():
Hx_start=float(_Hx)
Hx_end=float(_Hx)*(-1)
Hx_step=float(_dHx)
keith=Keithley2400('CURR') #Initiate K2400
amp = lockinAmp(func, sense, signal, freq) #Initiate Lock-in
while Hx_start>=Hx_end:
amp.dacOutput((Hx_start/ix), DACx)
current_max=float(_current)
current_min=float(_current)*(-1)
current_step=float(_step)
#while current_start>=current_end:
ax.clear()
ax.grid(True)
ax.set_title("Realtime Resistance vs I Plot")
ax.set_xlabel("Applied Pulsed Current (mA)")
ax.set_ylabel("Keithley 2400 Resistance (Ohm)")
listbox_l.insert('end',"Now measuring with Hx = %f (Oe)" %Hx_start)
listbox_l.see(END)
#Prepare data entries
global values_x, values_y, result
values_y=[]
values_x=[]
result=[]
#Setup K2400 for current output and resistance measurement
keith.setCurrent(0.1) #Use 0.1mA to measure DC resistance
keith.outputOn()
index=1
data=[]
while index<=5: #Average of five measurements
data=data+keith.measureOnce()
index+=1
print("Measured current: %f mA" %(1000*data[2]))
print("Measured voltage: %f V" %data[1])
print("Measured resistance: %f Ohm" %(data[1]/data[2]))
#Setup Keithley for Idc sweep
current=0.01
trigger_delay=float(_rest_length)
source_delay=float(_pulse_length)
while current < current_max :
keith.pulse(current,current_max, trigger_delay, source_delay)
data=keith.measureOnce()
tmp=double(data[1]/data[2]) #Resistance from K2400
result.append(tmp)
values_y.append(tmp)
values_x.append(current)
#ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
ax.plot(values_x, values_y,'b-o', ms=dot_size, mew=dot_edge, alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
current+=current_step
listbox_l.see(END)
while current > -current_max:
keith.pulse(current,current_max, trigger_delay, source_delay)
data=keith.measureOnce()
tmp=double(data[1]/data[2]) #Resistance from K2400
result.append(tmp)
values_y.append(tmp)
values_x.append(current)
#ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
ax.plot(values_x, values_y,'b-o', ms=dot_size, mew=dot_edge, alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
current-=current_step
listbox_l.see(END)
while current <= 0 :
keith.pulse(current, current_max, trigger_delay, source_delay)
data=keith.measureOnce()
tmp=double(data[1]/data[2]) #Resistance from K2400
result.append(tmp)
values_y.append(tmp)
values_x.append(current)
#ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
ax.plot(values_x, values_y,'b-o', ms=dot_size, mew=dot_edge, alpha=0.5)
canvas.draw()
listbox_l.insert('end', tmp)
current+=current_step
listbox_l.see(END)
stamp = datetime.now().strftime('%Y-%m-%d-%H%M%S')
listbox_l.insert('end', str(stamp))
file = open(str(directory)+"/MR_STT_pulsed_switching_"+str(_sample)+"_"+str(Hx_start)+"Oe_"+str(source_delay)+"s_"+str(stamp), "w")
file.write(str(_sample)+"\n")
file.write("Applied in-plane field: "+str(Hx_start)+"(Oe)\n\n")
file.write("Number"+" "+"Current(mA)"+" "+"Resistance(Ohm)"+"\n")
cnt=1
#output all data
for a in range(len(values_y)):
file.write(str(cnt)+" "+str(values_x[a])+" "+str(values_y[a])+"\n")
cnt +=1
file.closed
listbox_l.insert('end', "The Measurement data is saved.")
listbox_l.see(END)
keith.outputOff()
time.sleep(1) #Sleep between each scan
Hx_start=Hx_start-Hx_step
amp.dacOutput(0, DACx)
amp.dacOutput(0, DAC)
listbox_l.insert('end',"Measurement finished")
listbox_l.see(END)
def measure_method(magnet, keith, plot_title, x_axis_label, y_axis_label):
# make sure delay and averages are ints
if fetch_entry('Delay (s)', keith).lstrip('-').replace('.', '',
1).isdigit():
delay = float(fetch_entry('Delay (s)', keith))
else:
messagebox.showwarning(
'Invalid Entry',
'Delay value not found to be a number, automatically set to 1')
delay = 1
if fetch_entry('Averages', keith).lstrip('-').replace('.', '',
1).isdigit():
avg = float(fetch_entry('Averages', keith))
else:
messagebox.showwarning(
'Invalid Entry',
'Delay value not found to be a number, automatically set to 1')
avg = 1
# set the scan and fixed applied field directions
if H_dir_loop == 'Hz':
scan = 'Hz'
scan_dac = DACz
scan_interval = float(fetch_entry('Hz (Oe)/DAC (V)', magnet))
scan_limit = 1
fix = 'Hx'
fix_dac = DACx
fix_interval = float(fetch_entry('Hx (Oe)/DAC (V)', magnet))
fix_limit = 12
else:
scan = 'Hx'
scan_dac = DACx
scan_interval = float(fetch_entry('Hx (Oe)/DAC (V)', magnet))
scan_limit = 12
fix = 'Hz'
fix_dac = DACz
fix_interval = float(fetch_entry('Hz (Oe)/DAC (V)', magnet))
fix_limit = 1
# create the lists of field values, scan loop is modified to include full loop
if field_loop == 'Step':
scan_field_output = make_list(
fetch_entry('%s Field (Oe)' % scan, magnet),
fetch_entry('%s Step (Oe)' % scan, magnet))
inverse = reversed(scan_field_output[0:-1])
for x in inverse:
scan_field_output.append(x)
fix_field_output = make_list(
fetch_entry('%s Field (Oe)' % fix, magnet),
fetch_entry('%s Step (Oe)' % fix, magnet))
else:
scan_field_output = convert_to_list(
fetch_entry('%s Field (Oe)' % scan, magnet))
inverse = reversed(scan_field_output[0:-1])
for x in inverse:
scan_field_output.append(x)
fix_field_output = convert_to_list(
fetch_entry('%s Field (Oe)' % fix, magnet))
# create the list of current values
if current_loop == 'Step':
current_output = make_list(fetch_entry('Current (mA)', keith),
fetch_entry('Current Step (mA)', keith))
else:
current_output = convert_to_list(fetch_entry('Current (mA)', keith))
keith_2400 = Keithley2400('f') #Initiate K2400
keith_2000 = Keithley('f') #Initiate K2000
amp = lockinAmp(func, sense, signal, freq) #Initiate Lock-in
def event():
# if in bounds run scan
for fix_val in fix_field_output:
amp.dacOutput(fix_val / fix_interval, fix_dac)
for current_val in current_output:
#Setup K2400 for current output and initial resistance measurements
keith_2400.fourWireOff()
keith_2400.setCurrent(current_val)
keith_2400.outputOn()
index = 1
data = []
while index <= 5: #Average of five measurements
data = data + keith_2400.measureOnce()
index += 1
display.insert('end',
"Measured current: %f mA" % (1000 * data[2]))
display.insert('end', "Measured voltage: %f V" % data[1])
display.insert(
'end', "Measured resistance: %f Ohm" % (data[1] / data[2]))
display.see(END)
resistance = data[1] / data[2]
# intializes the measurement data list
measured_values = []
# reset the plot to be clear for graphing
plot_set(plot_title, x_axis_label, y_axis_label)
display.insert('end',
'Measurement at %s (mA)' % str(current_val))
display.insert('end', 'Measurement at %s (Oe)' % str(fix_val))
display.see(END)
# loop over all scan values
for scan_val in scan_field_output:
amp.dacOutput(scan_val / scan_interval, scan_dac)
# allows amp output to power fully up at high values
if len(measured_values) < 5:
time.sleep(0.5)
data = keith_2000.measureMulti(avg)
tmp = float(
1000 * data /
current_val) # Voltage from K2000 / Current from K2400
measured_values.append(tmp)
ax.plot(scan_field_output[0:len(measured_values)],
measured_values,
'b-o',
ms=10,
mew=0.5,
alpha=0.5)
dataplot.draw()
display.insert(
'end',
'Applied %s Field Value: %s (Oe) Measured Resistance: %s (Ohm)'
% (scan, scan_val, round(tmp, 4)))
display.see(END)
# save data
save_method(fix_val, current_val, scan_field_output,
measured_values)
# sleep between cycles
time.sleep(delay)
# turn everything off at end of loop
amp.dacOutput(0, fix_dac)
amp.dacOutput(0, scan_dac)
keith_2400.fourWireOff()
keith_2400.outputOn()
display.insert('end', "Measurement finished")
display.see(END)
#check to make sure all output values are in bounds.
if max(fix_field_output) / fix_interval < fix_limit and max(
scan_field_output) / scan_interval < scan_limit:
th = threading.Thread(target=event)
th.start()
else:
messagebox.showwarning('Output Too Large',
'Output value beyond amp voltage threshold')
display.insert('end', 'Output value too large!')
display.see(END)
def event():
keith = Keithley2400(f) #Initiate K2400
keith2000 = Keithley(f) #Initiate K2000
writetask = nidaqmx.Task() #Initiate GMW write & read channels
readtask = nidaqmx.Task()
Va_applied = writetask.ao_channels.add_ao_voltage_chan(
"VectorMagnet/ao0")
Vb_applied = writetask.ao_channels.add_ao_voltage_chan(
"VectorMagnet/ao1")
Vc_applied = writetask.ao_channels.add_ao_voltage_chan(
"VectorMagnet/ao2")
Field_X = readtask.ai_channels.add_ai_voltage_chan("VectorMagnet/ai0")
Field_Y = readtask.ai_channels.add_ai_voltage_chan("VectorMagnet/ai1")
Field_Z = readtask.ai_channels.add_ai_voltage_chan("VectorMagnet/ai2")
#readtask.read() will give [V_ai0, V_ai1, V_ai2]
current_start = float(_current)
current_end = float(_current) * (-1)
current_step = float(_step)
while current_start >= current_end:
ax.clear()
ax.grid(True)
ax.set_title("Realtime Resistance vs H Plot")
ax.set_xlabel("Applied Z Field (Oe)")
ax.set_ylabel("Hall Resistance (Ohm)")
listbox_l.insert(
'end', "Now measuring with Idc = %f (mA) " % (current_start))
listbox_l.see(END)
#Prepare data entries
global values_x, values_y, result, canvas
values_y = []
values_x = []
result = []
#Setup K2400 for current output and resistance measurement
keith.fourWireOff()
keith.setCurrent(current_start)
keith.outputOn()
index = 1
data = []
m_time = []
m_xfield = []
m_yfield = []
m_zfield = []
while index <= 5: #Average of five measurements
data = data + keith.measureOnce()
index += 1
listbox_l.insert('end',
"Measured current: %f mA" % (1000 * data[2]))
listbox_l.insert('end', "Measured voltage: %f V" % data[1])
listbox_l.insert(
'end', "Measured resistance: %f Ohm" % (data[1] / data[2]))
listbox_l.see(END)
resistance = data[1] / data[2]
#Setup lock-in for dac (Hz field) output
t = 0
a = (float(_output) / i) * (-1)
step = (double(_output) / i) / n
writetask.write(
[a, a, a]) #initial application of field to avoid outliers
while t < 2 * n:
writetask.write([a, a, a])
#sleep at start to avoid outliers
if t < 5:
time.sleep(.5)
start = time.time()
data = keith2000.measureMulti(average)
fdata = [
0, 0, 0
] # origin measured field is in unit V, ifield is conversion value with unit Oe/V
findex = 1
while findex <= 5: #Average of five measurements
fdata = [
fdata[i] + readtask.read()[i] for i in range(0, 3)
]
findex += 1
fielddata = [x * ifield / 5 for x in fdata
] #while loop is for averaging 5 measurements
print(fielddata)
m_zfield.append(fielddata[zchan])
m_xfield.append(fielddata[xchan])
m_yfield.append(fielddata[ychan])
tmp = double(
1000 * data / current_start
) # Voltage from K2000 / Current from K2400 (Hall resistance)
result.append(tmp)
values_y.append(tmp)
values_x.append(a * i)
#ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
mid = time.time()
ax.plot(values_x,
values_y,
'b-o',
ms=dot_size,
mew=dot_edge,
alpha=0.5)
canvas.draw()
listbox_l.insert(
'end', "Hall Resistance:" + str(round(tmp, 4)) +
" Applied Field:" + str(round(a * i, 4)) +
" Measured Field:" + str(round(fielddata[zchan], 4)))
t += 1
a += step
listbox_l.see(END)
fin = time.time()
m_time.append(fin - start)
print('Total Time: ', (fin - start), '\n Plot time: ',
(fin - mid))
while t <= 4 * n:
start = time.time()
writetask.write([a, a, a])
data = keith2000.measureMulti(average)
fdata = [
0, 0, 0
] # origin measured field is in unit V, ifield is conversion value with unit Oe/V
findex = 1
while findex <= 5: #Average of five measurements
fdata = [
fdata[i] + readtask.read()[i] for i in range(0, 3)
]
findex += 1
fielddata = [x * ifield / 5 for x in fdata
] #while loop is for averaging 5 measurements
m_zfield.append(fielddata[zchan])
m_xfield.append(fielddata[xchan])
m_yfield.append(fielddata[ychan])
tmp = double(
1000 * data /
current_start) # Voltage from K2000 / Current from K2400
result.append(tmp)
values_y.append(tmp)
values_x.append(a * i)
mid = time.time()
#ax.scatter(values_x[-1], values_y[-1], s=50, alpha=0.5)
ax.plot(values_x,
values_y,
'b-o',
ms=dot_size,
mew=dot_edge,
alpha=0.5)
canvas.draw()
listbox_l.insert(
'end', "Hall Resistance:" + str(round(tmp, 4)) +
" Applied Field:" + str(round(a * i, 4)) +
" Measured Field:" + str(round(fielddata[zchan], 4)))
t += 1
a -= step
listbox_l.see(END)
fin = time.time()
m_time.append(fin - start)
print('Total Time: ', (fin - start), '\n Plot time: ',
(fin - mid))
#Setup timestamp
stamp = datetime.now().strftime('%Y-%m-%d-%H%M%S')
listbox_l.insert('end', str(stamp))
file = open(
str(directory) + "/" + str(_sample) + "_GMW_pureZ_" +
str(round(resistance, 2)) + "Ohm_" +
str(round(current_start, 2)) + "mA_" + str(stamp), "w")
file.write("Sample name: " + str(_sample) + "\n")
file.write("Applied current: " + str(current_start) + "(mA)\n\n")
file.write("Number" + " " + "Applied Field(Oe)" + " " +
"Resistance(Ohm)" + " " + "Measure_time" + " " +
"Measured XField(Oe)" + " " + "Measured YField(Oe)" +
" " + "Measured ZField(Oe)" + "\n")
cnt = 1
#output all data
for a in range(len(values_y)):
file.write(
str(cnt) + " " + str(values_x[a]) + " " +
str(values_y[a]) + " " + str(m_time[a]) + " " +
str(m_xfield[a]) + " " + str(m_yfield[a]) + " " +
str(m_zfield[a]) + "\n")
cnt += 1
file.closed
listbox_l.insert('end', "The Measurement data is saved.")
listbox_l.see(END)
#keith.outputOff()
current_start = current_start - current_step
time.sleep(1) #Sleep between each scan
#amp.dacOutput(0, DACx)
#amp.dacOutput(0, DAC)
writetask.write([0, 0, 0])
writetask.close()
readtask.close()
keith.fourWireOff()
keith.outputOn()
listbox_l.insert('end', "Measurement finished")
listbox_l.see(END)
