Setup for Measuring the Galvanomagnetic Properties of Semiconducting Materials by Sample Rotation in the Field of Permanent Magnet

A setup providing measuring of galvanomagnetic parameters of semiconductor materials using sample rotation in the field of the permanent magnet is developed and manufactured. Measurements are carried out at room temperature and at a temperature close to the boiling point of liquid nitrogen (when the sample is placed in liquid nitrogen vapor). The rotation of the specimen is effected by means of the control/display unit based on a microcontroller that activates a stepper motor. The direction of the current through the sample is changed by a switch. The measured signal is fed via the interface to a personal computer, recorded and processed using a special software. The developed setup is tested on a sample of p-germanium at 300 and 82 ± ± 3 K. It is shown that at the indicated temperatures the dependences of the measured signal on the angle of sample rotation are close to sinusoidal and cross the zero-axis at 0, 180 and 360° which proves the absence of hysteresis. The feasibility of the setup can be significantly extended at increased values of the magnetic field induction close to 1,4 T which can be attained by replacing ofthe core bits. Processes of sample rotation control, recording of the measured signal and data processing can be automated through the development of the corresponding software.

гальваномагнитные измерения, постоянный магнит, вращение образца в магнитном поле, galvanomagnetic measurements, permanent magnet, sample rotation in magnetic field

1. Белов А. Г., Белогорохов А. И., Лакеенков В. М. Об особенностях электрофизических свойств гетероструктур CdxHg1-xTe/CdZnTe / Физика и техника полупроводников. 2001. Т. 35. №8. С. 917-919.

2. Белов А. Г., Белова И. М., Каневский В. Е., Свиридов М. С., Шленский А. А. О влиянии медленных электронов на полевые зависимости коэффициента Холла для твердых растворов CdxHg1-xTe при T = 77 К / Физика и техника полупроводников. 2007. Т. 41. № 10. С. 1178 - 1181.

3. Van der Pauw L. J. A Method of Measuring Specific Resistivity and Hall Effect of Discs of Arbitrary Shape / Philips Research Reports. 1958. Vol. 13. N 1. P. 1 - 9.

4. Van der Pauw L. J. A Method of Measuring the Resistivity and Hall Coefficient on Lamellae of Arbitrary Shape / Philips Technical Review. 1958. Vol. 20. N 8. P. 220 - 224.