Extraordinary magnetoelasticity and lattice softening in bcc Fe-Ga alloys
| Autor: | J. B. Restorff, Marilyn Wun-Fogle, Richard Andrew Taylor, V. Keppens, Gabriela Petculescu, Thomas A. Lograsso, Arthur E. Clark, K. B. Hathaway |
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| Rok vydání: | 2003 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 93:8621-8623 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.1540130 |
| Popis: | Extraordinary magnetostrictive behavior has been observed in Fe-Ga alloys with concentrations of Ga between 4% and 27%. λ100 exhibits two peaks as a function of Ga content. At room temperature, λ100 reaches a maximum of 265 ppm near 19% Ga and 235 ppm near 27% Ga. For compositions between 19% and 27%, λ100 drops sharply to a minimum near 24% Ga and exhibits an anomalous temperature dependence, decreasing by as much as a factor of 2 at low temperatures. This unusual magnetostrictive behavior is interpreted on the basis of a single maximum in the magnetoelastic coupling |b1| of Fe with increasing amounts of nonmagnetic Ga, combined with a strongly temperature dependent elastic shear modulus (c11−c12) which approaches zero near 27% Ga. λ111 is significantly smaller in magnitude than λ100 over this composition range, and has an abrupt change in sign from negative for low Ga concentrations to positive for a concentration of Ga near 21%. |
| Databáze: | OpenAIRE |
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