Magnetic properties and magnetic domain observation of ndfeb sintered magnets treated by grain boundary diffusion process with dyal co-sorption

Uenohara, Masaru; Nishio, Hiroaki; Toyoki, Kentaro; Shiratsuchi, Yu; Nakatani, Ryoichi; Machida, Ken-Ichi

doi:https://doi.org/10.2320/matertrans.MT-M2020389

Magnetic properties and magnetic domain observation of ndfeb sintered magnets treated by grain boundary diffusion process with dyal co-sorption

Uenohara, Masaru; Nishio, Hiroaki; Toyoki, Kentaro et al.

Materials Transactions, 2021, 62(8), 1216-1224

Number of Access:596（2025-10-05 09:42 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/89961

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Title	Magnetic properties and magnetic domain observation of ndfeb sintered magnets treated by grain boundary diffusion process with dyal co-sorption
Creator	CreatorName Uenohara, Masaru Affiliation Affiliation Name Identifier 0000000403733971 Affiliation Name 大阪大学 Osaka University
	CreatorName Nishio, Hiroaki
	NRID 1000090780007 1000090780007 ORCID 0000-0003-2887-0326 0000-0003-2887-0326 researchmap permalink k_toyoki k_toyoki Scopus Author ID 55970429100 55970429100 CreatorName Toyoki, Kentaro
	NRID 1000070379121 1000070379121 ORCID 0000-0002-8938-4869 0000-0002-8938-4869 researchmap permalink read0090304 read0090304 Scopus Author ID 6602197167 6602197167 CreatorName Shiratsuchi, Yu
	NRID 1000060314374 1000060314374 researchmap permalink read0068619 read0068619 Scopus Author ID 7005234924 7005234924 CreatorName Nakatani, Ryoichi
	NRID 1000000157223 1000000157223 researchmap permalink read0013931 read0013931 CreatorName Machida, Ken-Ichi
Subject	neodymiumironboron magnets
	coercivity
	grain boundary diffusion
Description	M.Uenohara, H.Nishio, K.Toyoki, et al. Magnetic properties and magnetic domain observation of ndfeb sintered magnets treated by grain boundary diffusion process with dyal co-sorption. Materials Transactions 62, 1216 (2021); https://doi.org/10.2320/matertrans.MT-M2020389.
Abstract	Effective grain boundary diffusion (GBD) process with DyAl co-sorption is applied to enhance the coercivity of NdFeB sintered magnets. The coercivity of the magnet (HcJ = 1789 kA m⁻¹) subjected to the present GBD treatment was observed to be superior to that of the untreated magnet (HcJ = 1003 kA m⁻¹) and the conventional GBD magnet (HcJ = 1661 kA m⁻¹) treated with DyAl alloy. In the present GBD magnet, the DyAl co-sorption process facilitated Dy diffusion into the center region of the magnet (thickness: 3.5 mm), resulting in high coercivity. Further, magnetic domain observations were made using magnetic force microscopy (MFM) to observe the thermal demagnetization behavior of the present GBD magnet. The present GBD magnet suppressed the continuous domain reversal of adjacent grains; thus, the partially persistent single-domain structure remained, even at 453 K.
Publisher	The Japan Institute of Metals and Materials
Source Title	Materials Transactions
Volume (Issue)	62(8)
Page	1216-1224
Date of Issued	2021-08-01
Language	English
Handle URL	https://hdl.handle.net/11094/89961
PISSN	13459678
NCID	AA1151294X
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.2320/matertrans.MT-M2020389
Access Rights	open access
oaire:version	Version of Record
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCMI Type	Text
DCTERMS.bibliographicCitation	Materials Transactions. 2021, 62(8), p. 1216-1224
DC.title	Magnetic properties and magnetic domain observation of ndfeb sintered magnets treated by grain boundary diffusion process with dyal co-sorption
DC.creator	Uenohara, Masaru
	Nishio, Hiroaki
	Toyoki, Kentaro
	Shiratsuchi, Yu
	Nakatani, Ryoichi
	Machida, Ken-Ichi
DC.publisher	The Japan Institute of Metals and Materials
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2021-08-01
DC.identifier	https://doi.org/10.2320/matertrans.MT-M2020389
DC.subject	neodymiumironboron magnets
	coercivity
	grain boundary diffusion
DC.description	M.Uenohara, H.Nishio, K.Toyoki, et al. Magnetic properties and magnetic domain observation of ndfeb sintered magnets treated by grain boundary diffusion process with dyal co-sorption. Materials Transactions 62, 1216 (2021); https://doi.org/10.2320/matertrans.MT-M2020389.
DCTERMS.abstract	Effective grain boundary diffusion (GBD) process with DyAl co-sorption is applied to enhance the coercivity of NdFeB sintered magnets. The coercivity of the magnet (HcJ = 1789 kA m⁻¹) subjected to the present GBD treatment was observed to be superior to that of the untreated magnet (HcJ = 1003 kA m⁻¹) and the conventional GBD magnet (HcJ = 1661 kA m⁻¹) treated with DyAl alloy. In the present GBD magnet, the DyAl co-sorption process facilitated Dy diffusion into the center region of the magnet (thickness: 3.5 mm), resulting in high coercivity. Further, magnetic domain observations were made using magnetic force microscopy (MFM) to observe the thermal demagnetization behavior of the present GBD magnet. The present GBD magnet suppressed the continuous domain reversal of adjacent grains; thus, the partially persistent single-domain structure remained, even at 453 K.
DC.format	89961
citation_title	Magnetic properties and magnetic domain observation of ndfeb sintered magnets treated by grain boundary diffusion process with dyal co-sorption
citation_author	Uenohara, Masaru
	Nishio, Hiroaki
	Toyoki, Kentaro
	Shiratsuchi, Yu
	Nakatani, Ryoichi
	Machida, Ken-Ichi
citation_publisher	The Japan Institute of Metals and Materials
citation_language	English
citation_date	2021-08-01
citation_journal_title	Materials Transactions
citation_volume	62
citation_issue	8
citation_firstpage	1216
citation_lastpage	1224
citation_doi	https://doi.org/10.2320/matertrans.MT-M2020389
citation_public_url	https://hdl.handle.net/11094/89961

Magnetic properties and magnetic domain observation of ndfeb sintered magnets treated by grain boundary diffusion process with dyal co-sorption

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