Coercivity mechanisms in nanostructured permanent magnets

doi:10.1088/1674-1056/28/7/077505

中国物理B ›› 2019, Vol. 28 ›› Issue (7): 77505-077505.doi: 10.1088/1674-1056/28/7/077505

所属专题： TOPICAL REVIEW — Magnetism, magnetic materials, and interdisciplinary research

• TOPICAL REVIEW—Magnetism, magnetic materials, and interdisciplinary research • 上一篇下一篇

Coercivity mechanisms in nanostructured permanent magnets

G P Zhao(赵国平), L Zhao(赵莉), L C Shen(沈来川), J Zou(邹静), L Qiu(邱雷)

1 College of Physics and Electronic Engineering & Institute of Solid State Physics, Sichuan Normal University, Chengdu 610066, China;
2 State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;
3 Collaborative Innovation Center for Shanxi Advanced Permanent Materials and Technology, Linfen 041004, China

收稿日期:2019-06-03 出版日期:2019-07-05 发布日期:2019-07-05
通讯作者: G P Zhao E-mail:zhaogp@uestc.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11074179, 51771127, 51571126, and 51772004) and the Scientific Research Fund of Sichuan Provincial Education Department, China (Grant Nos. 18TD0010 and 16CZ0006).

Coercivity mechanisms in nanostructured permanent magnets

G P Zhao(赵国平)^1,2,3, L Zhao(赵莉)¹, L C Shen(沈来川)¹, J Zou(邹静)¹, L Qiu(邱雷)¹

1 College of Physics and Electronic Engineering & Institute of Solid State Physics, Sichuan Normal University, Chengdu 610066, China;
2 State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;
3 Collaborative Innovation Center for Shanxi Advanced Permanent Materials and Technology, Linfen 041004, China

Received:2019-06-03 Online:2019-07-05 Published:2019-07-05
Contact: G P Zhao E-mail:zhaogp@uestc.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11074179, 51771127, 51571126, and 51772004) and the Scientific Research Fund of Sichuan Provincial Education Department, China (Grant Nos. 18TD0010 and 16CZ0006).

摘要/Abstract

摘要：

Coercivity mechanism in permanent magnets has been debated for many years. In this paper, various models of the coercivity mechanism are classified and re-examined by the comparison and contrast. Coherent rotation and curling models can reveal the underlying reversal mechanism clearly based on isolated grains with elliptic shapes. By contrast, the numerical methods consider inter-grain interactions while simulating the evolution of the spins and hysteresis loops with complicated shapes. However, an exact simulation of magnetic reversal in permanent nanomagnets requires many meshes to mimic the thin domain wall well.
Nucleation and pinning are the two main coercivity mechanisms in permanent magnets. The former signifies the beginning of the magnetic reversal, whilst the latter completes it. Recently, it is proposed that the large difference between the intrinsic magnetic properties of the nucleation centers and those of the main phase can result in a large pinning field (self-pinning), which has the attributes of both traditional nucleation and pinning. Such a pinning explains the experimental data of permanent magnets very well, including the enhancement of the coercivity by the grain boundary pinning.

关键词: coercivity mechanism, permanent nanomagnets, self-pinning

Abstract:

Key words: coercivity mechanism, permanent nanomagnets, self-pinning

中图分类号: (Permanent magnets)

75.50.Ww

75.75.-c (Magnetic properties of nanostructures)

赵国平, 赵莉, 沈来川, 邹静, 邱雷. Coercivity mechanisms in nanostructured permanent magnets[J]. 中国物理B, 2019, 28(7): 77505-077505.

G P Zhao(赵国平), L Zhao(赵莉), L C Shen(沈来川), J Zou(邹静), L Qiu(邱雷). Coercivity mechanisms in nanostructured permanent magnets[J]. Chin. Phys. B, 2019, 28(7): 77505-077505.

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Coercivity mechanisms in nanostructured permanent magnets

Coercivity mechanisms in nanostructured permanent magnets

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