Abstract
A mutual inductance bridge which may be used for automatic measurement of ac magnetic susceptibilities from 4 K to room temperature at frequencies up to 1 kHz is described. An alternative and new arrangement of the probe is described in details. The coil set is kept at room temperature and moves in such a way to place the sample in the center of each of the secondary coils. The sample, motionless, has its temperature controlled by a helium flow refrigerator. Use of a magnetic shield minimizes coupling of the probe with nearby magnetic materials. The movement of the probe and the operation of the bridge are fully controlled by a personal computer. This probe has a sensitivity of 10−7 emu in an ac magnetic field of 8 G rms and frequency of 100 Hz. The frequency range employed can easily be extended to 10 kHz without seriously affecting the accuracy of the measurements.
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