An induced torque magnetometer

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Abstract
A sensitive torque magnetometer for use in a superconducting magnet is described. A feedback mechanism is used to keep the sensitivity of the magnetometer independent of sample rotation and magnetic field. Sample rotation rate is controlled with precise readout of position through +or-100 degrees . A positional angle modulation technique makes the magnetometer an ideal tool for studies of induced torque. This technique eliminates static background torques and de Haas-van Alphen torque with the proper choice of modulation amplitude. Induced torque sensitivity is 100 times larger than that obtained by direct sample or magnet rotation. The field dependence of the induced torque at any sample position can be obtained directly in a single field sweep. Torques between 10-9 and 10-3 N m can be measured with a compliance of 180 rad N-1 m-1. The magnetometer is also useful for detecting the de Haas-van Alphen effect.

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