The use of magnetostrictive film transducers in the measurement of elastic moduli and ultrasonic attenuation of solids

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Abstract
The authors describe a novel method and apparatus for measuring the elastic moduli and ultrasonic attenuation of small samples (millimeter dimensions) over a wide temperature range. In the most general case, a nonmagnetic sample is coated with a thin film of a magnetostrictive material (e.g., nickel or iron-cobalt alloy). This film performs both as a driving transducer and as a receiving transducer. An alternating magnetic field of variable frequency generates a periodic stress in the film and drives the sample into mechanical resonances. The permeability of the film changes when the sample is resonating and allows the detection of the resonances. The operation of the system and the mathematical procedures to deduce the elastic moduli and ultrasonic attenuation from the measured resonance spectra are exemplified with measurements on amorphous Ni80P20 in the temperature range of 80–520 K.

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