X-ray diffuse scattering measurements of chemical short-range order and lattice strains in a highly magnetostrictive Fe0.813Ga0.187 alloy in an applied magnetic field

Y. Du, M. Huang, T. A. Lograsso, and R. J. McQueeney
Phys. Rev. B 85, 214437 – Published 28 June 2012

Abstract

The rapid growth of the magnetostriction coefficient of ferromagnetic Fe1xGax alloys that occurs at a composition range from 0<x<0.20 has recently been associated with the formation of nanoscale tetragonal precipitates close to an order-disorder transition. The structurally anisotropic precipitates are proposed to rotate in an applied magnetic field, thereby resulting in a large magnetoelastic response. X-ray diffuse scattering measurements sensitive to the atomic short-range ordering and lattice strain were performed on a quenched 18.7 at. % Ga alloy and show no dependence on the application of a magnetic field. This negative result sets limits on the role of nanoscale precipitates in magnetostriction.

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  • Received 21 February 2012

DOI:https://doi.org/10.1103/PhysRevB.85.214437

©2012 American Physical Society

Authors & Affiliations

Y. Du1, M. Huang2, T. A. Lograsso3, and R. J. McQueeney1,3

  • 1Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
  • 2Department of Materials and Metallurgical Engineering, South Dakota School of Mines, Rapid City, South Dakota 57701, USA
  • 3Division of Materials Sciences and Engineering, Ames Laboratory, Ames, Iowa 50011, USA

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Issue

Vol. 85, Iss. 21 — 1 June 2012

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