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Proceedings Paper

Giant magnetostriction materials from cryogenic temperatures to 250 C
Author(s): Arthur E. Clark
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Paper Abstract

Huge magnetoelastic interactions in the rare earths Tb, Dy, and Sm provide the basis of a technically important class of magnetostrictive materials with saturation strains, 10-3 < (Delta) l/l < 10-2. Rare earth elements, oxides, intermetallic compounds, and rapidly quenched amorphous metals all exhibit large magnetostrictions. Of particular importance here are the binary hexagonal TbxDy1-x alloys, which produce extremely high magnetostrictions at cryogenic temperatures, and the pseudobinary cubic TbxDy1-xFe2 compounds, which exhibit huge strains at room temperature and above. For the highly magnetostrictive room temperature materials, specific features which dominate the magnetostrictive behavior are: (1) large magnetic moments (approximately equals 1 T), (2) large magnetostriction anisotropy, (lambda) 111 >> (lambda) 100, and (3) changes in the magnetic easy axes from <100> (low magnetostrictive) to <111> (giant magnetostrictive) with temperature. Magnetostrictions > 10-3 are found as high as 150 degree(s)C in Tb.27Dy.73Fe2 and 250 degree(s)C in TbFe2.

Paper Details

Date Published: 13 January 1992
PDF: 8 pages
Proc. SPIE 1543, Active and Adaptive Optical Components, (13 January 1992); doi: 10.1117/12.51192
Show Author Affiliations
Arthur E. Clark, U.S. Naval Surface Warfare Ctr. (United States)

Published in SPIE Proceedings Vol. 1543:
Active and Adaptive Optical Components
Mark A. Ealey, Editor(s)

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