Abstract
Magnetostriction coefficients of ordered BeFe alloys were investigated, using the first-principles full-potential linearized augmented plane-wave method. A giant magnetostriction coefficient $(\ensuremath{\sim}1060\text{ }\text{ppm})$ was predicted in the ${\text{Fe}}_{0.8125}{\text{Be}}_{0.1875}$ alloy. We elucidated the origin of giant magnetostriction coefficient in terms of electronic structures and their responses to the tetragonal lattice distortion.
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