Strain measurement in ferromagnetic crystals using dark-field electron holography

Yasukazu Murakami, Kodai Niitsu, Syuhei Kaneko, Toshiaki Tanigaki, Taisuke Sasaki, Zentaro Akase, Daisuke Shindo, Tadakatsu Ohkubo, Kazuhiro Hono

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

This study proposes a method to separate the geometric phase shift due to lattice strain from the undesired phase information, resulting from magnetic fields that are superposed in the dark-field electron holography (DFEH) observations. Choosing a distinct wave vector for the Bragg reflection reversed the sense of the geometric phase shift, while the sense of the magnetic information remained unchanged. In the case of an Nd-Fe-B permanent magnet, once the unwanted signal was removed by data processing, the residual phase image revealed a strain map. Even though the applications of DFEH have thus far been limited to non-magnetic systems, the method proposed in this work is also applicable to strain measurements in various ferromagnetic systems.

Original languageEnglish
Article number193102
JournalApplied Physics Letters
Volume109
Issue number19
DOIs
Publication statusPublished - Nov 7 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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