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Anisotropy in twinned terfenol-D crystals

The highly magnetostrictive cubic compound Terfenol-D (Tb0.3Dy0.7Fe2) solidifies via a {211} dendritic growth front when grown by a free-standing zone technique. The resulting material is usually composed of dendritic plates often containing crystallographic twins, the predominant plate and twin pla...

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Bibliographic Details
Published in:Journal of applied physics 1994-11, Vol.76 (10), p.7151-7153
Main Authors: Lord, D. G., Harvey, D.
Format: Article
Language:English
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Summary:The highly magnetostrictive cubic compound Terfenol-D (Tb0.3Dy0.7Fe2) solidifies via a {211} dendritic growth front when grown by a free-standing zone technique. The resulting material is usually composed of dendritic plates often containing crystallographic twins, the predominant plate and twin plane being the (11̄1) orthogonal to the (2̄1̄1) growth plane. Results of room temperature magnetic torque analysis from (011) disk specimens, having differing twin densities, are presented which yield both the magnetic anisotropy constants, K1=−1.6×105 J/m3 and K2=−0.16×105 J/m3, and the relative parent/twin volume. Magnetic susceptibility data both parallel and transverse to the applied field are presented which, in conjunction with the anisotropy results, emphasize the importance of twin density on magnetoelastic response for typical application geometries.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.358526