Hall Effect Measurement System (HEMS, Electrical Characterization)
5 December 2024
Hall technique encompasses Hall Mobility Measurements, Hall Voltage Measurements, I-V Curve Measurements, Resistance Measurements, Magnetoresistance Measurements, Carrier Concentration Measurements, and Four- and Six-Contact Resistance Measurements. These measurements result from the interaction between the current passing through a material and the magnetic field applied to it.
- RT HEMS Head
- 4 and 6 contact capacity
- 4 contact van der Pauw measurements; 10 mOhm – 10 MOhm Resistance Measurements (<2% measurement instability)
- 6 contact Hall Bar measurements; 10 mOhm – 10 MOhm Resistance Measurements (<2% measurement instability)
- 1×1020cm3 maximum carrier density measurement suitable for operation at room temperature
- RT sample holder that allows simultaneous operation with 2 standard samples
- 67 T magnetic field in 2.5 cm gap at room temperature
- Gaussmeter, +/- 2.5 T
- Magnet Power Supply, +/- 50 A Current range, ± 3 mA Setting sensitivity
- 300 K + 5 K Maximum temperature capacity
- Yokogawa GS200 DC Voltage/Current Source
- ± 32 V Voltage range
- ± 200 mA Current range
- 5½ digits Setting accuracy
- 016% accuracy for voltage, 0.035% for current
- 1 uV output sensitivity for voltage, 100nA output sensitivity for current
- Less than 1 mVp-p noise
- 7709 Switch Card (Multiplexer)
- 10 channels for 2 poles
- 1 A current capacity for each channel
- 300 V voltage capacity
- 50 Ω – 1.2 Ω resistance range
- Keithley 2700 Multimeter/Data Acquisition System (DAQ)
- Measurement functions:
- DCV (Direct Current Voltage)
- ACV (Alternating Current Voltage)
- DCI (Direct Current Current)
- ACI (Alternating Current Current)
- 2-Wire Resistance Measurement
- 4-Wire Resistance Measurement
- Diode Test
- Continuity Test
- Capacitance
- Frequency
- Period
- Thermocouple Temperature Measurement
- RTD Temperature Measurement
- 6½ digits Setting accuracy
- 0025% accuracy for DCV
- 6½ digit LED display
- LT HEMS Head
- Operating capacity between 80-300K
- Liquid nitrogen tank
- Closed sample holder to create vacuum environment