Abstract
A novel method and apparatus for measuring the elastic moduli and ultrasonic attenuation of small samples (millimeter dimensions) over a wide temperature range is described. In the most general case, a nonmagnetic sample is coated with a thin film of a magnetostrictive material. The 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 are exemplified with measurements on amorphous and crystalline alloys. [Work supported by the U.S. Department of Energy.]
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