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Relation between Ga ordering and magnetostriction of Fe-Ga alloys studied by x-ray diffuse scattering
Physical Review B
  • Y. Du, Iowa State University
  • Mianliang Huang, Iowa State University
  • S. Chang, Iowa State University
  • Deborah L. Schlagel, Iowa State University
  • Thomas A. Lograsso, Iowa State University
  • Robert J. McQueeney, Iowa State University
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Transmission synchrotron diffraction was employed to characterize the Ga ordering in magnetostrictive Fe100−xGax alloys with Ga concentrations from 0 to 20.3 at. %. The experiments focused on the development of atomic short-range ordering (SRO) by analysis of the diffuse scattering appearing at superlattice positions of the D03 ordered alloy structure. No SRO was found for Ga concentrations less than 4 at. %. Between 13 and 20.3 at. %, D03-type SRO clusters are observed whose size increases with Ga concentration for both slow-cooled and quenched samples. Thermal quenching of the samples suppresses the cluster sizes when compared to slow-cooled samples of the same concentration. For quenched samples with large Ga concentration, Ga pairing is evidenced by growing B2-type correlations. At low concentrations, the presence of SRO appears to have little (if any) effect on the enhanced magnetostriction. However, the dramatic suppression of magnetostriction near ∼20 at. % Ga can be linked rapid growth of SRO just before the onset of long-range chemical order.

This article is from Physical Review B 81 (2010): 054432, doi:10.1103/PhysRevB.81.054432.

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American Physical Society
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Y. Du, Mianliang Huang, S. Chang, Deborah L. Schlagel, et al.. "Relation between Ga ordering and magnetostriction of Fe-Ga alloys studied by x-ray diffuse scattering" Physical Review B Vol. 81 Iss. 5 (2010) p. 054432
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