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Relation between Ga ordering and magnetostriction of Fe-Ga alloys studied by x-ray diffuse scattering

TitleRelation between Ga ordering and magnetostriction of Fe-Ga alloys studied by x-ray diffuse scattering
Publication TypeJournal Article
Year of Publication2010
AuthorsDu Y, Huang M, Chang S, Schlagel DL, Lograsso TA, McQueeney RJ
Journal TitlePhysical Review B
Volume81
Pages054432
Date Published02/01
ISBN Number1098-0121
Accession NumberISI:000274998000082
Keywordsdiffraction, EXTRINSIC MAGNETOSTRICTION, magnetoelasticity, SIMILAR MAGNETIC-ALLOYS, STRUCTURALLY HETEROGENEOUS MODEL
Abstract

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 D0(3) ordered alloy structure. No SRO was found for Ga concentrations less than 4 at. %. Between 13 and 20.3 at. %, D0(3)-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 similar to 20 at. % Ga can be linked rapid growth of SRO just before the onset of long-range chemical order.
URL<Go to ISI>://000274998000082
DOI10.1103/Physrevb.81.054432