4.7 Article

Structural anisotropy of amorphous alloys with creep-induced magnetic anisotropy

Journal

ACTA MATERIALIA
Volume 60, Issue 3, Pages 1278-1286

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2011.11.017

Keywords

Residual elastic strain; Relaxation; Heterogeneity in amorphous structures

Funding

  1. KAKENHI JSPS [18360340]
  2. Grants-in-Aid for Scientific Research [18360340] Funding Source: KAKEN

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Amorphous ribbons of different composition were annealed under tensile stress. This yielded a creep-induced magnetic anisotropy with an easy magnetic plane perpendicular to, or an easy axis parallel to, the ribbon direction, depending on the alloy composition. X-ray diffraction experiments and simple thermal expansion measurements show that the stress-annealed samples reveal a structural anisotropy which is released by post-annealing as a residual strain. This strain increases with the annealing stress and is therefore correlated with the induced magnetic anisotropy. The origin of this frozen-in strain is discussed in terms of structural heterogeneity in the strength of local atomic bonds. It is suggested that the induced magnetic anisotropy is related to the local magneto-elastic coupling in regions with strong bonding forces. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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