Abstract
The performance of magnetic transducers using soft magnetic materials such as metallic glass is degraded by static thermal or mechanical stresses,1 demagnetization, and magnetic hysteresis. We have investigated these effects using a distributed parameter model for the ac magnetostrictive response and have measured the response experimentally in strip and cylindrical samples of Metglas 2605 S2, using a fiber-optic strain gauge. The model assumes a two-element system with a different coercive field and a relative ac phase delay between the two elements, and an asymmetry in the ac response. The measurement technique uses an optical fiber interferometer to measure the small-signal ac magnetostrictive response as a function of a relatively large dc magnetic field scan. From a single measurement we determine the spread of the coercive magnetic field and the relative phase in the ac responses over the entire magnetic sample. Further measurements confirm the predictions of the model such as a residual signal at the ac modulation frequency.
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