Study of local magnetism by transmission electron microscopy

Yasukazu Murakami, Ryosuke Kainuma, Daisuke Shindo, Akira Tonomura

Research output: Contribution to journalArticlepeer-review

Abstract

Magnetic structures in advanced functional materials were studied by electron holography and Lorentz microscopy, both of which are the methods of magnetic imaging based on transmission electron microscopy. The microscopy observations revealed that antiphase boundaries (APBs: planar lattice imperfections) formed in a ferromagnetic shape memory alloy provided signifcant pinning sites for the magnetic domain walls. The width of magnetic domain walls trapped by APBs was only 10 nm, which was considerably smaller than the width of conventional 180°walls formed in cubic systems: this narrow wall width was reasonably explained by the depression of ferromagnetism within APBs. We also report on the original method to determine magnetic parameters, related to the exchange stiffness and the magnetocrystalline anisotropy, by using only electron microscopy observations.

Original languageEnglish
Pages (from-to)256-263
Number of pages8
JournalJournal of the Vacuum Society of Japan
Volume54
Issue number4
DOIs
Publication statusPublished - 2011

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Surfaces and Interfaces
  • Spectroscopy

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