Role of Nanoscale Precipitates on the Enhanced Magnetostriction of Heat-Treated Galfenol (Fe1-xGax) Alloys

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Date

2009-03-27

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Publisher

American Physical Society

Abstract

We report neutron diffuse scattering measurements on highly magnetostrictive Fe1-xGax alloys (0.14 < x < 0.20) with different thermal treatments. This diffuse scattering scales with magnetostriction and exhibits asymmetric peaks at the (100) and (300) reciprocal lattice positions that are consistent with the coexistence of short-range ordered, coherent nanometer-scale precipitates embedded in a long-range ordered, body-centered cubic matrix. A large peak splitting is observed at (300) for x=0.19, which indicates that the nanoprecipitates are not cubic and have a large elastic strain. This implies a structural origin for the enhanced magnetostriction.

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Keywords

Fe-Ga, Magnetoelasticity, Physics

Citation

Cao, H. ; Gehring, P. M. ; Devreugd, C. P. ; et al., Mar 27, 2009. “Role of Nanoscale Precipitates on the Enhanced Magnetostriction of Heat-Treated Galfenol (Fe1-xGax) Alloys,” PHYSICAL REVIEW LETTERS 102(12): 127201. DOI: 10.1103/PhysRevLett.102.127201