Magnetic microstructure analysis of ferromagnetic shape memory alloys and related compounds

Yasukazu Murakami, R. Kainuma, D. Shindo, A. Tonomura

研究成果: Contribution to journalArticle査読

1 被引用数 (Scopus)

抄録

We performed magnetic imaging of Ni-based ferromagnetic shape memory alloys. The magnetic microstructure was revealed by Lorentz microscopy and electron holography, which are powerful tools based on transmission electron microscopy. Observations of Ni51Fe22Ga27 and Ni50Mn25Al12.5Ga12.5 alloys, both of which have an L21-ordered structure in the parent phase, demonstrated that the antiphase boundaries (i.e., a type of planer defects) caused significant changes in the magnetization distribution due to depression of the atomic order - actually, the magnetization in these alloys depends upon the degree of chemical order. We propose a method which estimates the important magnetic parameters (the magnetocrystalline anisotropy constant and exchange stiffness constant) based on transmission electron microscopy observations. This method should be useful in magnetic measurements of nanometer-scale areas, for which conventional techniques cannot be applied.

本文言語英語
ページ(範囲)117-128
ページ数12
ジャーナルMaterials Science Forum
684
DOI
出版ステータス出版済み - 5 17 2011
外部発表はい

All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 凝縮系物理学
  • 機械工学
  • 材料力学

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