Interaction between Magnetic Domain Walls and Antiphase Boundaries in Ni2Mn(Al,Ga) Studied by Electron Holography and Lorentz Microscopy

T. Yano; Y. Murakami; R. Kainuma; D. Shindo

doi:10.2320/matertrans.MD200783

Interaction between Magnetic Domain Walls and Antiphase Boundaries in Ni₂Mn(Al,Ga) Studied by Electron Holography and Lorentz Microscopy

T. Yano, Y. Murakami, R. Kainuma, D. Shindo

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Keywords: antiphase boundary, ferromagnetic shape memory alloy, Lorentz microscopy, electron holography, magnetic domains

JOURNAL FREE ACCESS

2007 Volume 48 Issue 10 Pages 2636-2641

DOI https://doi.org/10.2320/matertrans.MD200783

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Abstract

The magnetization distribution in the L2₁ phase of a Ni₂Mn(Al,Ga) alloy, which is a type of ferromagnetic shape memory alloy, has been studied by electron holography and Lorentz microscopy. This alloy contains many antiphase boundaries (APBs), which are introduced by the chemical ordering from the B2 state to the L2₁ state. In situ Lorentz microscopy observations have revealed that APBs behave as strong pinning sites for domain wall motion. The width of a 180° wall, which was formed at the position of an APB, was estimated to be approximately 10 nm. This narrow domain wall was rationalized by the depression of ferromagnetism within APBs.

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