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A complete set of elastic constants Cij of an Fe79Si12B9 amorphous alloy free standing thin film has been determined by using ultrasound spectroscopy techniques. The out-of-plane shear moduli of C44 and C55 are measured by the thickness resonance frequencies and are almost elastic isotropic in the film plane indicating that the thin film has a hexagonal-type elastic symmetry. The remaining Cij in the symmetry are determined by the modified resonance ultrasound spectroscopy coupled with a laser-Doppler interferometory. Inverse calculation showed elastic anisotropies between the in-plane and the out-of-plane directions; C33/C11=1.21 and C66/C44=1.26. Magnetic property measurements also revealed the remarkable magnetization difference between the two directions suggesting that the structural difference between the in-plane and the out-of-plane directions would be responsible for them.
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Tarumi et al. (2007) studied this question.
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