Magnetic microstructure analysis of ferromagnetic shape memory alloys and related compounds

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

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)117-128
Number of pages12
JournalMaterials Science Forum
Volume684
DOIs
Publication statusPublished - May 17 2011
Externally publishedYes

Fingerprint

shape memory alloys
Shape memory effect
Magnetization
Electron holography
Transmission electron microscopy
Magnetocrystalline anisotropy
magnetization
transmission electron microscopy
microstructure
Microstructure
antiphase boundaries
Magnetic variables measurement
holography
magnetic measurement
stiffness
Microscopic examination
Stiffness
microscopy
Imaging techniques
Defects

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Magnetic microstructure analysis of ferromagnetic shape memory alloys and related compounds. / Murakami, Yasukazu; Kainuma, R.; Shindo, D.; Tonomura, A.

In: Materials Science Forum, Vol. 684, 17.05.2011, p. 117-128.

Research output: Contribution to journalArticle

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