Coercivity evolution and suppressed thermally activated defects in diffusion processed Nd-Fe-B films

Fulong Wei; Jinsong Zhang; Zhaohui Chen; Xiaoxiao Fu; Xiaomeng Fan; Xiaowei Yin; Peng Jia; Weibin Cui; Qiang Wang

doi:10.1016/j.jmmm.2019.04.090

Coercivity evolution and suppressed thermally activated defects in diffusion processed Nd-Fe-B films

Fulong Wei, Jinsong Zhang, Zhaohui Chen, Xiaoxiao Fu, Xiaomeng Fan, Xiaowei Yin, Peng Jia, Weibin Cui, Qiang Wang

School of Materials Sience and Engineering

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

2 Scopus citations

Abstract

The single-layer Ta(20 nm)Nd₁₃Fe₇₇B₁₀(100 nm)Ta(20 nm)film was prepared and diffusion-processed by Nd₂₅Cu₇₅(20 nm)and Nd₇₀Cu₃₀(20 nm). The evolutions of microstructure and magnetic properties were comparably studied. By using same amount of diffusion layer, different coercivities were achieved. The coercivity enhancement mechanism was explained phenomenologically by surface defects of Nd₂Fe₁₄B grains and estimation of activation volume. It was found that due to the increased Nd composition in grain boundaries, the activation volume was reduced and the local anisotropy was enhanced due to the remedied surface defect. Such dependence was consistent with the coercivity changes.

Original language	English
Pages (from-to)	401-406
Number of pages	6
Journal	Journal of Magnetism and Magnetic Materials
Volume	485
DOIs	https://doi.org/10.1016/j.jmmm.2019.04.090
State	Published - 1 Sep 2019

Keywords

Activation volume
Coercivity mechanism
Diffusion process
Microstructure
Nd-Fe-B thin films

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10.1016/j.jmmm.2019.04.090

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title = "Coercivity evolution and suppressed thermally activated defects in diffusion processed Nd-Fe-B films",

abstract = "The single-layer Ta(20 nm)Nd13Fe77B10(100 nm)Ta(20 nm)film was prepared and diffusion-processed by Nd25Cu75(20 nm)and Nd70Cu30(20 nm). The evolutions of microstructure and magnetic properties were comparably studied. By using same amount of diffusion layer, different coercivities were achieved. The coercivity enhancement mechanism was explained phenomenologically by surface defects of Nd2Fe14B grains and estimation of activation volume. It was found that due to the increased Nd composition in grain boundaries, the activation volume was reduced and the local anisotropy was enhanced due to the remedied surface defect. Such dependence was consistent with the coercivity changes.",

keywords = "Activation volume, Coercivity mechanism, Diffusion process, Microstructure, Nd-Fe-B thin films",

author = "Fulong Wei and Jinsong Zhang and Zhaohui Chen and Xiaoxiao Fu and Xiaomeng Fan and Xiaowei Yin and Peng Jia and Weibin Cui and Qiang Wang",

note = "Publisher Copyright: {\textcopyright} 2019",

year = "2019",

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doi = "10.1016/j.jmmm.2019.04.090",

language = "英语",

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TY - JOUR

T1 - Coercivity evolution and suppressed thermally activated defects in diffusion processed Nd-Fe-B films

AU - Wei, Fulong

AU - Zhang, Jinsong

AU - Chen, Zhaohui

AU - Fu, Xiaoxiao

AU - Fan, Xiaomeng

AU - Yin, Xiaowei

AU - Jia, Peng

AU - Cui, Weibin

AU - Wang, Qiang

PY - 2019/9/1

Y1 - 2019/9/1

N2 - The single-layer Ta(20 nm)Nd13Fe77B10(100 nm)Ta(20 nm)film was prepared and diffusion-processed by Nd25Cu75(20 nm)and Nd70Cu30(20 nm). The evolutions of microstructure and magnetic properties were comparably studied. By using same amount of diffusion layer, different coercivities were achieved. The coercivity enhancement mechanism was explained phenomenologically by surface defects of Nd2Fe14B grains and estimation of activation volume. It was found that due to the increased Nd composition in grain boundaries, the activation volume was reduced and the local anisotropy was enhanced due to the remedied surface defect. Such dependence was consistent with the coercivity changes.

AB - The single-layer Ta(20 nm)Nd13Fe77B10(100 nm)Ta(20 nm)film was prepared and diffusion-processed by Nd25Cu75(20 nm)and Nd70Cu30(20 nm). The evolutions of microstructure and magnetic properties were comparably studied. By using same amount of diffusion layer, different coercivities were achieved. The coercivity enhancement mechanism was explained phenomenologically by surface defects of Nd2Fe14B grains and estimation of activation volume. It was found that due to the increased Nd composition in grain boundaries, the activation volume was reduced and the local anisotropy was enhanced due to the remedied surface defect. Such dependence was consistent with the coercivity changes.

KW - Activation volume

KW - Coercivity mechanism

KW - Diffusion process

KW - Microstructure

KW - Nd-Fe-B thin films

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U2 - 10.1016/j.jmmm.2019.04.090

DO - 10.1016/j.jmmm.2019.04.090

M3 - 文章

AN - SCOPUS:85065846504

SN - 0304-8853

VL - 485

SP - 401

EP - 406

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

ER -

Coercivity evolution and suppressed thermally activated defects in diffusion processed Nd-Fe-B films

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Keywords

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