Giant magnetostriction materials from cryogenic temperatures to 250 C

Details Giant magnetostriction materials from cryogenic temperatures to 250 C Giant magnetostriction materials from cryogenic temperatures to 250 C

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1543..374c&link_type=abstract

Proc. SPIE Vol. 1543, p. 374-381, Active and Adaptive Optical Components, Mark A. Ealey; Ed.

Computer Science

1

Scientific paper

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(superscript -3) < (Delta) l/l < 10(superscript -2). Rare earth elements, oxides, intermetallic compounds, and rapidly quenched amorphous metals all exhibit large magnetostrictions. Of particular importance here are the binary hexagonal Tb(subscript x)Dy(subscript 1-x) alloys, which produce extremely high magnetostrictions at cryogenic temperatures, and the pseudobinary cubic Tb(subscript x)Dy(subscript 1-x)Fe(subscript 2) 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) (subscript 111) >> (lambda) (subscript 100), and (3) changes in the magnetic easy axes from <100> (low magnetostrictive) to <111> (giant magnetostrictive) with temperature. Magnetostrictions > 10(superscript -3) are found as high as 150 degree(s)C in Tb(subscript .27)Dy(subscript .73)Fe(subscript 2) and 250 degree(s)C in TbFe(subscript 2).

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