Magnetic field distribution of permanent magnet magnetized by static magnetic field generated by HTS bulk magnet

Tetsuo Oka; Nobutaka Kawasaki; Satoshi Fukui; Jun Ogawa; Takao Sato; Toshihisa Terasawa; Yoshitaka Itoh; Ryohei Yabuno

doi:10.1109/TASC.2011.2179510

Magnetic field distribution of permanent magnet magnetized by static magnetic field generated by HTS bulk magnet

Tetsuo Oka, Nobutaka Kawasaki, Satoshi Fukui, Jun Ogawa, Takao Sato, Toshihisa Terasawa, Yoshitaka Itoh, Ryohei Yabuno

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

8 Citations (Scopus)

Abstract

Demagnetized rare earth magnets (Nd-Fe-B) can be fully magnetized by scanning them in the intense static fields over 3 T of a HTS bulk magnet which was cooled to the temperature range lower than 77K with use of cryo-coolers and activated by the field of 5 T. We precisely examined the magnetic field distributions of magnetized permanent magnets. The magnetic poles were in the narrow space on the surface of the permanent magnet with varying gap distances between the tracks of the HTS magnetic pole. Steep magnetic transitions between N and S were observed in the magnetic field distribution maps after the HTS magnetic poles were alternatively scanned for several times. The magnetizing method has been proposed for designing novel electromagnetic devices including magnetically excellent rare earth magnets which require intense magnetic fields over 3 T.

Original language	English
Article number	6101562
Journal	IEEE Transactions on Applied Superconductivity
Volume	22
Issue number	3
DOIs	https://doi.org/10.1109/TASC.2011.2179510
Publication status	Published - 2012
Externally published	Yes

Keywords

Bulk superconductor
magnetic field
permanent magnet
refrigerator
trapped field

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1109/TASC.2011.2179510

Cite this

@article{87f9ab228365479e94479906e15b0950,

title = "Magnetic field distribution of permanent magnet magnetized by static magnetic field generated by HTS bulk magnet",

abstract = "Demagnetized rare earth magnets (Nd-Fe-B) can be fully magnetized by scanning them in the intense static fields over 3 T of a HTS bulk magnet which was cooled to the temperature range lower than 77K with use of cryo-coolers and activated by the field of 5 T. We precisely examined the magnetic field distributions of magnetized permanent magnets. The magnetic poles were in the narrow space on the surface of the permanent magnet with varying gap distances between the tracks of the HTS magnetic pole. Steep magnetic transitions between N and S were observed in the magnetic field distribution maps after the HTS magnetic poles were alternatively scanned for several times. The magnetizing method has been proposed for designing novel electromagnetic devices including magnetically excellent rare earth magnets which require intense magnetic fields over 3 T.",

keywords = "Bulk superconductor, magnetic field, permanent magnet, refrigerator, trapped field",

author = "Tetsuo Oka and Nobutaka Kawasaki and Satoshi Fukui and Jun Ogawa and Takao Sato and Toshihisa Terasawa and Yoshitaka Itoh and Ryohei Yabuno",

note = "Funding Information: Manuscript received September 06, 2011; accepted December 04, 2011. Date of publication December 12, 2011; date of current version May 24, 2012. This work was supported in part by IMRA MATERIAL R&D CO. T. Oka, N. Kawasaki, S. Fukui, J. Ogawa, and T. Sato are with Niigata University, Niigata, 8050 Ikarashi-Ninocho, Nishi-ku 950-2181, Japan (e-mail: okat@eng.niigata-u.ac.jp). T. Terasawa, Y. Itoh, and R. Yabuno are with IMRA MATERIAL R&D CO., Aichi, 2-1 Asahimachi, Kariya 448-0032, Japan (e-mail: toshi-t@ai-i.aisin. co.jp). Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TASC.2011.2179510",

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doi = "10.1109/TASC.2011.2179510",

language = "English",

volume = "22",

journal = "IEEE Transactions on Applied Superconductivity",

issn = "1051-8223",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

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T1 - Magnetic field distribution of permanent magnet magnetized by static magnetic field generated by HTS bulk magnet

AU - Oka, Tetsuo

AU - Kawasaki, Nobutaka

AU - Fukui, Satoshi

AU - Ogawa, Jun

AU - Sato, Takao

AU - Terasawa, Toshihisa

AU - Itoh, Yoshitaka

AU - Yabuno, Ryohei

N1 - Funding Information: Manuscript received September 06, 2011; accepted December 04, 2011. Date of publication December 12, 2011; date of current version May 24, 2012. This work was supported in part by IMRA MATERIAL R&D CO. T. Oka, N. Kawasaki, S. Fukui, J. Ogawa, and T. Sato are with Niigata University, Niigata, 8050 Ikarashi-Ninocho, Nishi-ku 950-2181, Japan (e-mail: okat@eng.niigata-u.ac.jp). T. Terasawa, Y. Itoh, and R. Yabuno are with IMRA MATERIAL R&D CO., Aichi, 2-1 Asahimachi, Kariya 448-0032, Japan (e-mail: toshi-t@ai-i.aisin. co.jp). Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TASC.2011.2179510

PY - 2012

Y1 - 2012

N2 - Demagnetized rare earth magnets (Nd-Fe-B) can be fully magnetized by scanning them in the intense static fields over 3 T of a HTS bulk magnet which was cooled to the temperature range lower than 77K with use of cryo-coolers and activated by the field of 5 T. We precisely examined the magnetic field distributions of magnetized permanent magnets. The magnetic poles were in the narrow space on the surface of the permanent magnet with varying gap distances between the tracks of the HTS magnetic pole. Steep magnetic transitions between N and S were observed in the magnetic field distribution maps after the HTS magnetic poles were alternatively scanned for several times. The magnetizing method has been proposed for designing novel electromagnetic devices including magnetically excellent rare earth magnets which require intense magnetic fields over 3 T.

AB - Demagnetized rare earth magnets (Nd-Fe-B) can be fully magnetized by scanning them in the intense static fields over 3 T of a HTS bulk magnet which was cooled to the temperature range lower than 77K with use of cryo-coolers and activated by the field of 5 T. We precisely examined the magnetic field distributions of magnetized permanent magnets. The magnetic poles were in the narrow space on the surface of the permanent magnet with varying gap distances between the tracks of the HTS magnetic pole. Steep magnetic transitions between N and S were observed in the magnetic field distribution maps after the HTS magnetic poles were alternatively scanned for several times. The magnetizing method has been proposed for designing novel electromagnetic devices including magnetically excellent rare earth magnets which require intense magnetic fields over 3 T.

KW - Bulk superconductor

KW - magnetic field

KW - permanent magnet

KW - refrigerator

KW - trapped field

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Magnetic field distribution of permanent magnet magnetized by static magnetic field generated by HTS bulk magnet

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Keywords

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