Electron holography on remanent magnetization distribution of melt-spun Nd-Fe-B magnets

Young Gil Park; Daisuke Shindo

doi:10.1093/jmicro/53.1.43

Electron holography on remanent magnetization distribution of melt-spun Nd-Fe-B magnets

Young Gil Park, Daisuke Shindo

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

Microstructures and magnetic domain structures of melt-spun Nd-Fe-B permanent magnets were investigated in detail by analytical electron microscopy and electron holography. While the crystal orientation of matrix Nd ₂Fe₁₄B grains was analyzed by nanobeam electron diffraction, precipitates of a few tens of nanometers at grain boundaries were identified to be α-Fe by energy-dispersive X-ray spectroscopy. The detailed magnetization distribution in Nd₂Fe₁₄B grains and at their boundaries was visualized by electron holography. Ex situ experimentation with an electromagnet revealed that the domain walls in the demagnetized state and remanent states were pinned at grain boundaries, and Fe precipitates at the grain boundary were situated at the center of the closure domain.

Original language	English
Pages (from-to)	43-47
Number of pages	5
Journal	Journal of Electron Microscopy
Volume	53
Issue number	1
DOIs	https://doi.org/10.1093/jmicro/53.1.43
Publication status	Published - 2004

Keywords

Domain wall pinning
Electron holography
Energy-dispersive X-ray spectroscopy
Lines of magnetic flux
Nanobeam electron diffraction
ex situ experiment

ASJC Scopus subject areas

Instrumentation

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title = "Electron holography on remanent magnetization distribution of melt-spun Nd-Fe-B magnets",

abstract = "Microstructures and magnetic domain structures of melt-spun Nd-Fe-B permanent magnets were investigated in detail by analytical electron microscopy and electron holography. While the crystal orientation of matrix Nd 2Fe14B grains was analyzed by nanobeam electron diffraction, precipitates of a few tens of nanometers at grain boundaries were identified to be α-Fe by energy-dispersive X-ray spectroscopy. The detailed magnetization distribution in Nd2Fe14B grains and at their boundaries was visualized by electron holography. Ex situ experimentation with an electromagnet revealed that the domain walls in the demagnetized state and remanent states were pinned at grain boundaries, and Fe precipitates at the grain boundary were situated at the center of the closure domain.",

keywords = "Domain wall pinning, Electron holography, Energy-dispersive X-ray spectroscopy, Lines of magnetic flux, Nanobeam electron diffraction, ex situ experiment",

author = "Park, {Young Gil} and Daisuke Shindo",

note = "Funding Information: The authors gratefully acknowledge Dr H. Hiroyoshi for providing them with the melt-spun Nd2Fe14B samples. Also, the authors are grateful to Dr Y. Murakami and Dr Y. Gao, Tohoku University, for useful discussions. They also thank Ms N. Kobayashi, YKK Corp., for her help with the NBD and EDS analyses. The work was carried out with financial support from the Special Coordination Funds for Promoting Science and Technology on {\textquoteleft}Nanohetero Metallic Materials{\textquoteright} from the Science and Technology Agency. This work was partly supported by a Grant-in-Aid for Scientific Research (B) from the Japan Society for the Promotion of Science.",

year = "2004",

doi = "10.1093/jmicro/53.1.43",

language = "English",

volume = "53",

pages = "43--47",

journal = "Microscopy (Oxford, England)",

issn = "2050-5698",

publisher = "Japanese Society of Microscopy",

number = "1",

}

TY - JOUR

T1 - Electron holography on remanent magnetization distribution of melt-spun Nd-Fe-B magnets

AU - Park, Young Gil

AU - Shindo, Daisuke

N1 - Funding Information: The authors gratefully acknowledge Dr H. Hiroyoshi for providing them with the melt-spun Nd2Fe14B samples. Also, the authors are grateful to Dr Y. Murakami and Dr Y. Gao, Tohoku University, for useful discussions. They also thank Ms N. Kobayashi, YKK Corp., for her help with the NBD and EDS analyses. The work was carried out with financial support from the Special Coordination Funds for Promoting Science and Technology on ‘Nanohetero Metallic Materials’ from the Science and Technology Agency. This work was partly supported by a Grant-in-Aid for Scientific Research (B) from the Japan Society for the Promotion of Science.

PY - 2004

Y1 - 2004

N2 - Microstructures and magnetic domain structures of melt-spun Nd-Fe-B permanent magnets were investigated in detail by analytical electron microscopy and electron holography. While the crystal orientation of matrix Nd 2Fe14B grains was analyzed by nanobeam electron diffraction, precipitates of a few tens of nanometers at grain boundaries were identified to be α-Fe by energy-dispersive X-ray spectroscopy. The detailed magnetization distribution in Nd2Fe14B grains and at their boundaries was visualized by electron holography. Ex situ experimentation with an electromagnet revealed that the domain walls in the demagnetized state and remanent states were pinned at grain boundaries, and Fe precipitates at the grain boundary were situated at the center of the closure domain.

AB - Microstructures and magnetic domain structures of melt-spun Nd-Fe-B permanent magnets were investigated in detail by analytical electron microscopy and electron holography. While the crystal orientation of matrix Nd 2Fe14B grains was analyzed by nanobeam electron diffraction, precipitates of a few tens of nanometers at grain boundaries were identified to be α-Fe by energy-dispersive X-ray spectroscopy. The detailed magnetization distribution in Nd2Fe14B grains and at their boundaries was visualized by electron holography. Ex situ experimentation with an electromagnet revealed that the domain walls in the demagnetized state and remanent states were pinned at grain boundaries, and Fe precipitates at the grain boundary were situated at the center of the closure domain.

KW - Domain wall pinning

KW - Electron holography

KW - Energy-dispersive X-ray spectroscopy

KW - Lines of magnetic flux

KW - Nanobeam electron diffraction

KW - ex situ experiment

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AN - SCOPUS:1642414447

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EP - 47

JO - Microscopy (Oxford, England)

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Electron holography on remanent magnetization distribution of melt-spun Nd-Fe-B magnets

Abstract

Keywords

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