Interfacial state and magnetic properties of Nd-Fe-B/Nd thin films

Masashi Matsuura; Satoshi Sugimoto; Ryota Goto; Nobuki Tezuka

doi:10.1063/1.3076050

Interfacial state and magnetic properties of Nd-Fe-B/Nd thin films

Masashi Matsuura, Satoshi Sugimoto, Ryota Goto, Nobuki Tezuka

ENG - Materials Science

Tohoku University

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

33 Citations (Scopus)

Abstract

Nd-Fe-B/Nd(-O) interfaces were prepared by thin film technique for the investigation of relationship between interfacial state and coercivity. A Nd-Fe-B layer was deposited by UHV magnetron sputtering and the film was oxidized under low vacuum conditions. On the oxidized Nd-Fe-B layer, a Nd layer was deposited and the film was annealed at 250-650 °C. The coercivity of Nd-Fe-B layer decreased after the oxidation. However, it recovered after the deposition of Nd layer and the annealing at 350 °C. High-resolution transmission electron microscopy (HRTEM) observations revealed that an fcc NdO phase forms after the oxidation and an amorphous phase exists along the interface between Nd2 Fe14 B and Nd2 O3 phases after annealing at 350 °C. Therefore, the recovery of coercivity is related to the amorphous phase, which is considered to be formed by the transformation from NdO to Nd2 O3 and α-Nd, and the release of strain at the interface.

Original language	English
Article number	07A741
Journal	Journal of Applied Physics
Volume	105
Issue number	7
DOIs	https://doi.org/10.1063/1.3076050
Publication status	Published - 2009

Access to Document

10.1063/1.3076050

Cite this

@article{1cc806e274074723aa2880f4e700775e,

title = "Interfacial state and magnetic properties of Nd-Fe-B/Nd thin films",

abstract = "Nd-Fe-B/Nd(-O) interfaces were prepared by thin film technique for the investigation of relationship between interfacial state and coercivity. A Nd-Fe-B layer was deposited by UHV magnetron sputtering and the film was oxidized under low vacuum conditions. On the oxidized Nd-Fe-B layer, a Nd layer was deposited and the film was annealed at 250-650 °C. The coercivity of Nd-Fe-B layer decreased after the oxidation. However, it recovered after the deposition of Nd layer and the annealing at 350 °C. High-resolution transmission electron microscopy (HRTEM) observations revealed that an fcc NdO phase forms after the oxidation and an amorphous phase exists along the interface between Nd2 Fe14 B and Nd2 O3 phases after annealing at 350 °C. Therefore, the recovery of coercivity is related to the amorphous phase, which is considered to be formed by the transformation from NdO to Nd2 O3 and α-Nd, and the release of strain at the interface.",

author = "Masashi Matsuura and Satoshi Sugimoto and Ryota Goto and Nobuki Tezuka",

note = "Funding Information: The authors would like to thank Dr. T. Miyazaki and Dr. K. Kobayashi of Tohoku University for their help in TEM observation. This work was partially supported by Rare Metal Substitute Materials Development Project, Development of technology for reducing dysprosium usage in a rare-earth magnet, from METI and NEDO, JAPAN.",

year = "2009",

doi = "10.1063/1.3076050",

language = "English",

volume = "105",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics",

number = "7",

}

TY - JOUR

T1 - Interfacial state and magnetic properties of Nd-Fe-B/Nd thin films

AU - Matsuura, Masashi

AU - Sugimoto, Satoshi

AU - Goto, Ryota

AU - Tezuka, Nobuki

N1 - Funding Information: The authors would like to thank Dr. T. Miyazaki and Dr. K. Kobayashi of Tohoku University for their help in TEM observation. This work was partially supported by Rare Metal Substitute Materials Development Project, Development of technology for reducing dysprosium usage in a rare-earth magnet, from METI and NEDO, JAPAN.

PY - 2009

Y1 - 2009

N2 - Nd-Fe-B/Nd(-O) interfaces were prepared by thin film technique for the investigation of relationship between interfacial state and coercivity. A Nd-Fe-B layer was deposited by UHV magnetron sputtering and the film was oxidized under low vacuum conditions. On the oxidized Nd-Fe-B layer, a Nd layer was deposited and the film was annealed at 250-650 °C. The coercivity of Nd-Fe-B layer decreased after the oxidation. However, it recovered after the deposition of Nd layer and the annealing at 350 °C. High-resolution transmission electron microscopy (HRTEM) observations revealed that an fcc NdO phase forms after the oxidation and an amorphous phase exists along the interface between Nd2 Fe14 B and Nd2 O3 phases after annealing at 350 °C. Therefore, the recovery of coercivity is related to the amorphous phase, which is considered to be formed by the transformation from NdO to Nd2 O3 and α-Nd, and the release of strain at the interface.

AB - Nd-Fe-B/Nd(-O) interfaces were prepared by thin film technique for the investigation of relationship between interfacial state and coercivity. A Nd-Fe-B layer was deposited by UHV magnetron sputtering and the film was oxidized under low vacuum conditions. On the oxidized Nd-Fe-B layer, a Nd layer was deposited and the film was annealed at 250-650 °C. The coercivity of Nd-Fe-B layer decreased after the oxidation. However, it recovered after the deposition of Nd layer and the annealing at 350 °C. High-resolution transmission electron microscopy (HRTEM) observations revealed that an fcc NdO phase forms after the oxidation and an amorphous phase exists along the interface between Nd2 Fe14 B and Nd2 O3 phases after annealing at 350 °C. Therefore, the recovery of coercivity is related to the amorphous phase, which is considered to be formed by the transformation from NdO to Nd2 O3 and α-Nd, and the release of strain at the interface.

UR - http://www.scopus.com/inward/record.url?scp=65249123962&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=65249123962&partnerID=8YFLogxK

U2 - 10.1063/1.3076050

DO - 10.1063/1.3076050

M3 - Article

AN - SCOPUS:65249123962

SN - 0021-8979

VL - 105

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 7

M1 - 07A741

ER -

Interfacial state and magnetic properties of Nd-Fe-B/Nd thin films

Abstract

Access to Document

Other files and links

Fingerprint

Cite this