connect_opticool()

No input. Return the telnet object connecting to the socket server of the OptiCool.

read_temperature(telnetObj)

Input the telnet object returned by connect_opticool(). Return an array [temperature, status]. The status means the temperature approaching status, which can be “Standby”, “Tracking”, “Chasing”, “Near” and “Stable”.

set_temperature(telnetObj, set_point, rate, mode)

Input 4 arguments, telnet object, temperature set point, ramp rate, mode. The highest ramp rate is 10 K/min. The mode has two options.

• 0: Fast settle

• 1: No overshoot

Return “command received”.

read_field(telnetObj)

Input the telnet object. Return an array [field, status]. The status means the field approaching status, which can be “Ramping (Driven)” and “Holding (Driven)”.

set_field(telnetObj, set_point, rate, approach_mode, 1)

Input 5 arguments, telnet object, field set point, ramp rate, approach mode, field mode. The highest ramp rate is 110 Oe/s. The approach mode has three options.

• 0: Linear

• 1: No overshoot

• 2: Oscillate

The field mode has only one option in the OptiCool, but has two options in the PPMS and MPMS3. In this way, just use the value 1 for the field mode, which means “Driven”.

Return “command received”.

disconnect_opticool(telnetObj)

Close the telnet object returned by connect_opticool().

initialization_lakeshore336()

Return the instrument object (inst).

read_temperature(inst)

Input the instrument object obtained from initialization_lakeshore336(). Return the temperature.

read_setpoint(inst)

Input the instrument object. Return the temperature setpoint.

set_setpoint(inst, output, set_temperature)

Input 3 arguments, instrument object, output port number (1, 2, 3, 4) and temperature setpoint.

read_ramp(inst)

Input the instrument object. Return an array [on_off, ramp rate].

set_ramp(inst, output, on_off, ramp_rate)

Input 4 arguments, instrument object, output port number (1, 2, 3, 4), on_off (0, 1) and ramp rate.

close_lakeshore336(inst)

Input the instrument object. Close the connection with the lakeshore 336.

SingleStageMove(axis_index, pos, go_back)

Corotate(axis_index_1, pos_1, go_back_1, axis_index_2, pos_2, go_back_2)

Read_Position(axis_index)

Balance_PID_single(incident_polarization_angle, P, tolerance, balance_axis_index, channel_index, time_constant)

P can be extracted from Find_balance_angle in the Measurement section.

Read_Position(axis_index)

SingleStageMove(axis_index, real_target, tolerance, go_back)

DoubleStageMove(axis_index_1, real_target_1, tolerance_1, go_back_1, axis_index_2, real_target_2, tolerance_2, go_back_2)

Lockin_time_record(channel_index, recording_time, time_constant, filename_head)

This function simply records the data from lock-in amplifier in real time.

Find_balance_angle(incident_polarization_angle, axis_index, start_pos, step_size, num_of_steps, go_back, channel_index, time_constant, filename_head)

This function automatically finds the balance angle in MOKE measurement.

Corotate_measurement(num_of_steps, axis_index_1, start_pos_1, step_size_1, go_back_1, axis_index_2, start_pos_2, step_size_2, go_back_2, channel_index, time_constant, filename_head)

This function takes a single birefringence measurement.

Pump_probe(axis_index, start_pos, step_size, num_of_steps, go_back, channel_index, time_constant, filename_head)

This function takes a single pump-probe measurement.

Mapping(filename_head)

This functions takes a MOKE mapping.

Pol_scan_Mapping(filename_head)

This functions takes a birefringence mapping.

Balance_PID_single(incident_polarization_angle, P, tolerance, balance_axis_index, channel_index, time_constant)

This PID-based function automatically finds the balance angle in MOKE measurement. P can be extracted from Find_balance_angle.

Field_scan(set_points, ramp_rate, balance_axis_index, channel_index, time_constant, balance_channel_index, filename_head)

This function take measurements in an applied field. Set points need to be an array.

Field_scan_PID(set_points, ramp_rate, balance_axis_index, channel_index, time_constant, P, balance_channel_index, balance_time_constant, filename_head)

This function take measurements in an applied field. The artifact from Faraday rotation of the window is automatically compensated via PID. Set points need to be an array. P can be extracted from Find_balance_angle.