DX-1000H High Temperature Hall Measurement Setup

Working principle of DX-1000H High Temperature Hall Measurement Setup

1. The electromagnet current source provides current to the electromagnet to generate a magnetic field;
2. The gauss meter measures the value of the uniform magnetic field generated by the electromagnet;
3. On the one hand, the constant current source provides sample test current to the sample for Hall effect testing, and on the other hand, it is used to measure the Hall voltage fed back by the sample;
4. The sample to be tested is placed in a high-temperature vacuum chamber, fixed by high-temperature glue, and used as four test points;
5. There are 4 leads from the high-temperature vacuum chamber, two of which are connected to the temperature controller for temperature measurement and control, the other is the lead wire of the high-temperature probe connected to the Gauss meter, and the other is connected to the Hall sample connection wire to the constant current source ;
6. The computer is connected to a gauss meter, a temperature controller, a constant current source and an electromagnet current source, and the software controls the current and magnetic field values passing through the sample being measured, and obtains the measured voltage value.

Testable materials of Hall Measurement Setup:

1. Semiconductor materials: SiGe, SiC, InAs, InGaAs, InP, AlGaAs, HgCdTe and ferrite materials, etc.;
2. Low impedance materials: graphene, metals, transparent oxides, weakly magnetic semiconductor materials, TMR materials, etc.;
3. High resistance materials: semi-insulating GaAs, GaN, CdTe, etc.

Technical indicators of Hall Measurement Setup:

1. Magnetic field: 10mm spacing is 2T; 30mm spacing is 1T;
2. Sample current: 0.05uA~50mA (adjustable 0.1nA);
3. Measuring voltage: 0.1uV~30V;
4. Provide various test standard materials, all levels of silicon and gallium arsenide (sensitivity and accuracy are different;
5. Minimum resolution: 0.1GS;
6. Magnetic field range: 0-1T;
7. Can be used with gauss meter or data acquisition board for computer communication;
8. I-V curve and I-R curve measurement, etc.;
9. Change curves of parameters such as Hall coefficient and carrier concentration with temperature;
10. Resistivity range: 5*10^-4~10⁸Ω.cm;
11. Resistance range: 10mΩ-100GΩ;
12. Carrier concentration: 6*10⁸~10²³cm^-3;
13. Migration rate: 1~10⁶cm²/vs;
14. Temperature control accuracy: 0.1K;
15. Temperature zone: 4K-773K (optional);
16. Hall coefficient: ±1*10^-5~±1*10¹⁰cm³/C;
17. The test is fully automated and processed with one click;
18. Continuous measurement of the same temperature difference can be achieved.

Parameters of each component:

High precision electromagnet

1. Pole diameter 100mm;
2. The maximum magnetic field is 20000Gs when the distance between N and S is 10mm;
3. Maximum 13000 Gauss when N, S spacing is 20mm;
4. The maximum magnetic field is 10000 Gauss when the distance between N and S is 30mm;
5. Uniform area: When the spacing is 60mm, the uniformity range is 1% for a diameter of 10mm;
6. Weight: 110kg including bracket and wheels.

High-precision bipolar constant current power supply

1. Output: ±10A±80V;
2. Power; 800W;
3. The power supply output current can continuously change between positive and negative rated maximum current;
4. The current can smoothly cross the zero point and reverse without switching;
5. Output current and voltage four-quadrant operation (suitable for inductive loads);
6. The current change rate can be set in the range of 0.0007~0.3 F.S./s (F.S. is the rated maximum output current);
7. Current stability: better than ±25ppm/h (standard type); better than ±5ppm/h (high stability type);
8. Current accuracy: ± (0.01% set value + 1mA);
9. Current resolution: 20 bits, for example, 15A power supply, the current resolution is 0.03mA;
10. Source effect: ≤ 2.0×10-5 F.S. (when the power supply voltage changes by 10%, the output current changes);
11. Load effect: ≤ 2.0×10-5 F.S. (output current change when load changes by 10%);
12. Current Ripple (RMS): Less than 1mA.

High precision gauss meter:

1. Accuracy: ±0.30% of reading;
2. Resolution: 0.01mT Range: 0-3T;
3. Probe thickness: 1.0mm;
4. Length 100mm digital;
5. Rs-232 interface data reading software equipped with GP3 probe;
6. Gauss meter probe bracket and sample holder All-aluminum non-magnetic bracket 5-70mm adjustable;
7. Sample holder fixture (customized upon request).

High temperature thermostat

1. 293K-470K) high and low temperature vacuum vessels;
2. TESK301 thermostat: temperature control (65k-600k);
3. Vacuum Pump K25 Vacuum Pump.

Constant current source and test meter

1. Constant current source range: ±50nA-±50mA;
2. Resolution 0.1nA, continuously adjustable within the range;
3. High-precision voltage data acquisition instrument range 0. 1uV-30V;
4. Accuracy: 0.01%;
5. Built-in test matrix conversion card;
6. Ohmic contact kits make kits based on ohmic contacts of different materials.