Magnetoelastic Properties of Rare-Earth Elements and Compounds
Semiannual rept. 5 Nov 1971-4 May 1972
RICE UNIV HOUSTON TX MATERIALS SCIENCE LAB
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The report describes the technical accomplishments attained during the third six-month period of a research program on the magnetic and magnetoelastic properties of rare-earth elements, alloys, and compounds. The research carried out during the period covered by this report has been concentrated in three major areas studies on elastic-wave propagation in terbium at frequencies in the megahertz range have shown the existence of very strong field-induced acoustic birefringence in single-crystal speciments., magnetostrictive ultrasonic transducers in the form of thin polycrystalline films have been constructed using several pure rare-earth elements and a terbium-iron compound, a semiclassical theory of magnetoelastic interactions in rare-earth materials, which is based on an equation-of-motion approach to the dynamical behavior of magnetic materials, has yielded results which are applicable to both the two preceding areas of research and which, in particular, should make possible the design of more efficient microwave ultrasonic transducers.
- Solid State Physics