Document Type

Article

Publication Date

2-22-2010

Journal or Book Title

Physical Review B

Volume

81

Issue

5

First Page

054432

DOI

10.1103/PhysRevB.81.054432

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 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.

Comments

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

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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