Magnetic domain evolution in Nd-Fe-B:Cu sintered magnet visualized by scanning hard X-ray microprobe

Motohiro Suzuki; Akira Yasui; Yoshinori Kotani; Naruki Tsuji; Tetsuya Nakamura; Satoshi Hirosawa

doi:10.1016/j.actamat.2016.01.011

Magnetic domain evolution in Nd-Fe-B:Cu sintered magnet visualized by scanning hard X-ray microprobe

Motohiro Suzuki, Akira Yasui, Yoshinori Kotani, Naruki Tsuji, Tetsuya Nakamura, Satoshi Hirosawa

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

24 Citations (Scopus)

Abstract

The formation and development of the magnetic domain structures of an Nd₂Fe₁₄B sintered magnet doped with 0.1% Cu are studied during the demagnetization process. A scanning hard X-ray microprobe with X-ray magnetic circular dichroism at the Nd L₂ edge is applied to investigate the evolution of magnetic domains with the applied magnetic field on a fractured surface. Reversed magnetic domains are initially formed in the Nd-Fe-B main phase grains beside the Cu-abundant regions that superposes on an Nd-rich phase. This characteristic formation of initial domains is reproducibly observed throughout several demagnetization cycles after the magnetization becomes saturated, suggesting the presence of specific nucleation sites that trigger the magnetization reversal.

Original language	English
Pages (from-to)	155-161
Number of pages	7
Journal	Acta Materialia
Volume	106
DOIs	https://doi.org/10.1016/j.actamat.2016.01.011
Publication status	Published - 2016 Mar
Externally published	Yes

Keywords

Magnetic domains
Magnetization process
Microstructures
Nd-Fe-B sintered magnets
X-ray magnetic imaging

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/j.actamat.2016.01.011

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title = "Magnetic domain evolution in Nd-Fe-B:Cu sintered magnet visualized by scanning hard X-ray microprobe",

abstract = "The formation and development of the magnetic domain structures of an Nd2Fe14B sintered magnet doped with 0.1% Cu are studied during the demagnetization process. A scanning hard X-ray microprobe with X-ray magnetic circular dichroism at the Nd L2 edge is applied to investigate the evolution of magnetic domains with the applied magnetic field on a fractured surface. Reversed magnetic domains are initially formed in the Nd-Fe-B main phase grains beside the Cu-abundant regions that superposes on an Nd-rich phase. This characteristic formation of initial domains is reproducibly observed throughout several demagnetization cycles after the magnetization becomes saturated, suggesting the presence of specific nucleation sites that trigger the magnetization reversal.",

keywords = "Magnetic domains, Magnetization process, Microstructures, Nd-Fe-B sintered magnets, X-ray magnetic imaging",

author = "Motohiro Suzuki and Akira Yasui and Yoshinori Kotani and Naruki Tsuji and Tetsuya Nakamura and Satoshi Hirosawa",

note = "Funding Information: The authors thank A. Fujiwara and M. Takata of JASRI, as well as T. Ohkubo and K. Hono of NIMS for useful discussions. We are grateful to T. Nishiuchi and T. Fukagawa of Hitachi Metals, Ltd. for supplying the Nd–Fe–B sample, and S. Okamoto of IMRAM for magnetic characterization of the bulk sample. The synchrotron radiation experiments were performed under the approval of the JASRI (Proposal Nos. 2012A1845, 2012B1015, 2013B1264, and 2014A1187). Part of this work was supported by the Elements Strategy Initiative Project under the auspices of MEXT. Publisher Copyright: {\textcopyright} 2016 Acta Materialia Inc.",

year = "2016",

month = mar,

doi = "10.1016/j.actamat.2016.01.011",

language = "English",

volume = "106",

pages = "155--161",

journal = "Acta Materialia",

issn = "1359-6454",

publisher = "Elsevier Limited",

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T1 - Magnetic domain evolution in Nd-Fe-B:Cu sintered magnet visualized by scanning hard X-ray microprobe

AU - Suzuki, Motohiro

AU - Yasui, Akira

AU - Kotani, Yoshinori

AU - Tsuji, Naruki

AU - Nakamura, Tetsuya

AU - Hirosawa, Satoshi

N1 - Funding Information: The authors thank A. Fujiwara and M. Takata of JASRI, as well as T. Ohkubo and K. Hono of NIMS for useful discussions. We are grateful to T. Nishiuchi and T. Fukagawa of Hitachi Metals, Ltd. for supplying the Nd–Fe–B sample, and S. Okamoto of IMRAM for magnetic characterization of the bulk sample. The synchrotron radiation experiments were performed under the approval of the JASRI (Proposal Nos. 2012A1845, 2012B1015, 2013B1264, and 2014A1187). Part of this work was supported by the Elements Strategy Initiative Project under the auspices of MEXT. Publisher Copyright: © 2016 Acta Materialia Inc.

PY - 2016/3

Y1 - 2016/3

N2 - The formation and development of the magnetic domain structures of an Nd2Fe14B sintered magnet doped with 0.1% Cu are studied during the demagnetization process. A scanning hard X-ray microprobe with X-ray magnetic circular dichroism at the Nd L2 edge is applied to investigate the evolution of magnetic domains with the applied magnetic field on a fractured surface. Reversed magnetic domains are initially formed in the Nd-Fe-B main phase grains beside the Cu-abundant regions that superposes on an Nd-rich phase. This characteristic formation of initial domains is reproducibly observed throughout several demagnetization cycles after the magnetization becomes saturated, suggesting the presence of specific nucleation sites that trigger the magnetization reversal.

AB - The formation and development of the magnetic domain structures of an Nd2Fe14B sintered magnet doped with 0.1% Cu are studied during the demagnetization process. A scanning hard X-ray microprobe with X-ray magnetic circular dichroism at the Nd L2 edge is applied to investigate the evolution of magnetic domains with the applied magnetic field on a fractured surface. Reversed magnetic domains are initially formed in the Nd-Fe-B main phase grains beside the Cu-abundant regions that superposes on an Nd-rich phase. This characteristic formation of initial domains is reproducibly observed throughout several demagnetization cycles after the magnetization becomes saturated, suggesting the presence of specific nucleation sites that trigger the magnetization reversal.

KW - Magnetic domains

KW - Magnetization process

KW - Microstructures

KW - Nd-Fe-B sintered magnets

KW - X-ray magnetic imaging

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JO - Acta Materialia

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Magnetic domain evolution in Nd-Fe-B:Cu sintered magnet visualized by scanning hard X-ray microprobe

Abstract

Keywords

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