Interface state and coercivity in Nd-Fe-B/Dy films

Jin Umezawa; Yoshiki Sakai; Kunihiro Koike; Daisuke Ogawa; Yoshiyuki Mizuno; Hiroaki Kato; Takamichi Miyazaki; Yasuo Ando

doi:10.3938/jkps.63.616

Interface state and coercivity in Nd-Fe-B/Dy films

Jin Umezawa, Yoshiki Sakai, Kunihiro Koike, Daisuke Ogawa, Yoshiyuki Mizuno, Hiroaki Kato, Takamichi Miyazaki, Yasuo Ando

ENG - Applied Physics

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

1 Citation (Scopus)

Abstract

We fabricated a model interface system, which consised of a Nd₂Fe₁₄B layer with Dy overlayers, in order to study the relationship between the microstructure near the interface and the coercivity. The coercivity H _c of the 1-μm-thick Nd-Fe-B films with a Dy overlayer was enhanced by thermal diffusion of Dy atoms from the film's surface into the Nd-Fe-B layer. The Nd-Fe-B/Dy films annealed at 700 °C showed a significant increase in the H _c of up to about 17 kOe. The maximum increase in the value of the coercivity ΔH _c of the annealed films with a Dy overlayer was approximately 13 kOe. The XRD measurement suggested the existence of rare-earth oxides (NdO and Dy₂O₃) in the Dy-coated films with high value of the ΔH _c.

Original language	English
Pages (from-to)	616-619
Number of pages	4
Journal	Journal of the Korean Physical Society
Volume	63
Issue number	3
DOIs	https://doi.org/10.3938/jkps.63.616
Publication status	Published - 2013 Aug

Keywords

Coercivity
Dy
NdFeB
Thin films

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title = "Interface state and coercivity in Nd-Fe-B/Dy films",

abstract = "We fabricated a model interface system, which consised of a Nd2Fe14B layer with Dy overlayers, in order to study the relationship between the microstructure near the interface and the coercivity. The coercivity H c of the 1-μm-thick Nd-Fe-B films with a Dy overlayer was enhanced by thermal diffusion of Dy atoms from the film's surface into the Nd-Fe-B layer. The Nd-Fe-B/Dy films annealed at 700 °C showed a significant increase in the H c of up to about 17 kOe. The maximum increase in the value of the coercivity ΔH c of the annealed films with a Dy overlayer was approximately 13 kOe. The XRD measurement suggested the existence of rare-earth oxides (NdO and Dy2O3) in the Dy-coated films with high value of the ΔH c.",

keywords = "Coercivity, Dy, NdFeB, Thin films",

author = "Jin Umezawa and Yoshiki Sakai and Kunihiro Koike and Daisuke Ogawa and Yoshiyuki Mizuno and Hiroaki Kato and Takamichi Miyazaki and Yasuo Ando",

note = "Funding Information: This work was supported partly by the Rare Metal Substitute Metals Development Project on Development of Technology, from New Energy and Industrial Technology Development Organizaiton (NEDO), Japan; by the Industry-Academia Collaborative R&D Programs, from Japan Science and Technology Agency (JST), Japan; by a Grant-in-Aid for Scientific Research (grant No. 22560688) from Japan Society for the Promotion of Science (JSPS), Japan.",

year = "2013",

month = aug,

doi = "10.3938/jkps.63.616",

language = "English",

volume = "63",

pages = "616--619",

journal = "Journal of the Korean Physical Society",

issn = "0374-4884",

publisher = "Korean Physical Society",

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TY - JOUR

T1 - Interface state and coercivity in Nd-Fe-B/Dy films

AU - Umezawa, Jin

AU - Sakai, Yoshiki

AU - Koike, Kunihiro

AU - Ogawa, Daisuke

AU - Mizuno, Yoshiyuki

AU - Kato, Hiroaki

AU - Miyazaki, Takamichi

AU - Ando, Yasuo

N1 - Funding Information: This work was supported partly by the Rare Metal Substitute Metals Development Project on Development of Technology, from New Energy and Industrial Technology Development Organizaiton (NEDO), Japan; by the Industry-Academia Collaborative R&D Programs, from Japan Science and Technology Agency (JST), Japan; by a Grant-in-Aid for Scientific Research (grant No. 22560688) from Japan Society for the Promotion of Science (JSPS), Japan.

PY - 2013/8

Y1 - 2013/8

N2 - We fabricated a model interface system, which consised of a Nd2Fe14B layer with Dy overlayers, in order to study the relationship between the microstructure near the interface and the coercivity. The coercivity H c of the 1-μm-thick Nd-Fe-B films with a Dy overlayer was enhanced by thermal diffusion of Dy atoms from the film's surface into the Nd-Fe-B layer. The Nd-Fe-B/Dy films annealed at 700 °C showed a significant increase in the H c of up to about 17 kOe. The maximum increase in the value of the coercivity ΔH c of the annealed films with a Dy overlayer was approximately 13 kOe. The XRD measurement suggested the existence of rare-earth oxides (NdO and Dy2O3) in the Dy-coated films with high value of the ΔH c.

AB - We fabricated a model interface system, which consised of a Nd2Fe14B layer with Dy overlayers, in order to study the relationship between the microstructure near the interface and the coercivity. The coercivity H c of the 1-μm-thick Nd-Fe-B films with a Dy overlayer was enhanced by thermal diffusion of Dy atoms from the film's surface into the Nd-Fe-B layer. The Nd-Fe-B/Dy films annealed at 700 °C showed a significant increase in the H c of up to about 17 kOe. The maximum increase in the value of the coercivity ΔH c of the annealed films with a Dy overlayer was approximately 13 kOe. The XRD measurement suggested the existence of rare-earth oxides (NdO and Dy2O3) in the Dy-coated films with high value of the ΔH c.

KW - Coercivity

KW - Dy

KW - NdFeB

KW - Thin films

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EP - 619

JO - Journal of the Korean Physical Society

JF - Journal of the Korean Physical Society

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ER -

Interface state and coercivity in Nd-Fe-B/Dy films

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