Direct observation of magnetization reversal in thin Nd 2Fe 14B film

H. S. Park; Y. G. Park; Y. Gao; D. Shindo; M. Inoue

doi:10.1063/1.1836003

Direct observation of magnetization reversal in thin Nd ₂Fe ₁₄B film

H. S. Park, Y. G. Park, Y. Gao, D. Shindo, M. Inoue

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19 Citations (Scopus)

Abstract

By utilizing a sharp magnetic needle made of a sintered Nd ₂Fe ₁₄B permanent magnet, we were able to produce a strong magnetic field of up to approximately 560 kA/m in a transmission electron microscope and succeeded in observing the magnetization reversal in a thin film of sintered Nd ₂Fe ₁₄B by in situ Lorentz microscopy. The increase in the magnetic field induced by the magnetic needle led to a pair of straight magnetic domain walls forming abruptly from the grain boundary. The successive nucleation in the neighboring grain started at the grain boundary adjacent to the magnetic domain wall formed first. Eventually, the magnetic domain walls in the neighboring grains connected and moved continuously and finally disappeared.

Original language	English
Article number	033908
Journal	Journal of Applied Physics
Volume	97
Issue number	3
DOIs	https://doi.org/10.1063/1.1836003
Publication status	Published - 2005 Feb 1
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1063/1.1836003

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title = "Direct observation of magnetization reversal in thin Nd 2Fe 14B film",

abstract = "By utilizing a sharp magnetic needle made of a sintered Nd 2Fe 14B permanent magnet, we were able to produce a strong magnetic field of up to approximately 560 kA/m in a transmission electron microscope and succeeded in observing the magnetization reversal in a thin film of sintered Nd 2Fe 14B by in situ Lorentz microscopy. The increase in the magnetic field induced by the magnetic needle led to a pair of straight magnetic domain walls forming abruptly from the grain boundary. The successive nucleation in the neighboring grain started at the grain boundary adjacent to the magnetic domain wall formed first. Eventually, the magnetic domain walls in the neighboring grains connected and moved continuously and finally disappeared.",

author = "Park, {H. S.} and Park, {Y. G.} and Y. Gao and D. Shindo and M. Inoue",

note = "Funding Information: The authors thank Dr. Y. Murakami, IMRAM, Tohoku University, and Dr. Y. Yoshinari, JEOL Ltd. for their helpful discussions. They also thank Dr. A. Fukuno, TDK Ltd. for providing the samples. This work was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture of Japan and by the Special Coordination Funds for Promoting Science and Technology of “Nanohetero Metallic Materials” from the Science and Technology Agency.",

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AU - Park, H. S.

AU - Park, Y. G.

AU - Gao, Y.

AU - Shindo, D.

AU - Inoue, M.

N1 - Funding Information: The authors thank Dr. Y. Murakami, IMRAM, Tohoku University, and Dr. Y. Yoshinari, JEOL Ltd. for their helpful discussions. They also thank Dr. A. Fukuno, TDK Ltd. for providing the samples. This work was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture of Japan and by the Special Coordination Funds for Promoting Science and Technology of “Nanohetero Metallic Materials” from the Science and Technology Agency.

PY - 2005/2/1

Y1 - 2005/2/1

N2 - By utilizing a sharp magnetic needle made of a sintered Nd 2Fe 14B permanent magnet, we were able to produce a strong magnetic field of up to approximately 560 kA/m in a transmission electron microscope and succeeded in observing the magnetization reversal in a thin film of sintered Nd 2Fe 14B by in situ Lorentz microscopy. The increase in the magnetic field induced by the magnetic needle led to a pair of straight magnetic domain walls forming abruptly from the grain boundary. The successive nucleation in the neighboring grain started at the grain boundary adjacent to the magnetic domain wall formed first. Eventually, the magnetic domain walls in the neighboring grains connected and moved continuously and finally disappeared.

AB - By utilizing a sharp magnetic needle made of a sintered Nd 2Fe 14B permanent magnet, we were able to produce a strong magnetic field of up to approximately 560 kA/m in a transmission electron microscope and succeeded in observing the magnetization reversal in a thin film of sintered Nd 2Fe 14B by in situ Lorentz microscopy. The increase in the magnetic field induced by the magnetic needle led to a pair of straight magnetic domain walls forming abruptly from the grain boundary. The successive nucleation in the neighboring grain started at the grain boundary adjacent to the magnetic domain wall formed first. Eventually, the magnetic domain walls in the neighboring grains connected and moved continuously and finally disappeared.

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Direct observation of magnetization reversal in thin Nd ₂Fe ₁₄B film

Abstract

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