All independent elastic moduli of an Fe‐Si‐B amorphous alloy thin film using electromagnetic acoustic resonance (EMAR) and resonant ultrasound spectroscopy coupled with laser‐doppler interferometry (RUS/Laser) have been determined. Using a thickness resonance EMAR technique, in‐plane shear moduli of c44 and c55 are determined to be 73.2 and 71.0 GPa indicating that the amorphous alloy thin film has a hexagonal‐type elastic symmetry. The remaining moduli are obtained by RUS/Laser technique as follows: c11 = 193.6, c33 = 234.3, c23 = 72.1 and c12 = 79.8 GPa. Using the complete set of elastic moduli, the acoustic Debye temperature, ΘD, is estimated to be 451 K which is close to that of pure α‐Fe (ΘD = 471 K). Compressional and shear anisotropies become c33/c11 = 1.21 and c66/c44 = 1.26 indicating remarkable elastic anisotropies between in‐plane and out‐of‐plane directions even though in the amorphous structure.

Topics
Debye temperature, Acoustic spectroscopy, Acoustic phenomena, Elastic modulus, Shear modulus, Thin films, Doppler interferometry
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© 2005 American Institute of Physics.
2005
American Institute of Physics
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