Micromagnetic simulations of reversal magnetization in cerium-containing magnets

doi:10.1088/1674-1056/28/3/037502

中国物理B ›› 2019, Vol. 28 ›› Issue (3): 37502-037502.doi: 10.1088/1674-1056/28/3/037502

所属专题： Virtual Special Topic — Magnetism and Magnetic Materials

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Micromagnetic simulations of reversal magnetization in cerium-containing magnets

Lei Li(李磊), Shengzhi Dong(董生智), Hongsheng Chen(陈红升), Ruijiao Jiang(姜瑞姣), Dong Li(李栋), Rui Han(韩瑞), Dong Zhou(周栋), Minggang Zhu(朱明刚), Wei Li(李卫), Wei Sun(孙威)

1 Division of Functional Materials Research, Central Iron and Steel Research Institute, Beijing 100081, China;
2 National Engineering Research Center for Magnetic Materials, Beijing 102600, China

收稿日期:2018-10-10 修回日期:2019-01-09 出版日期:2019-03-05 发布日期:2019-03-05
通讯作者: Shengzhi Dong E-mail:dong_shengzhi@163.com
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51590882 and 51871063).

Micromagnetic simulations of reversal magnetization in cerium-containing magnets

Lei Li(李磊)¹, Shengzhi Dong(董生智)¹, Hongsheng Chen(陈红升)¹, Ruijiao Jiang(姜瑞姣)¹, Dong Li(李栋)¹, Rui Han(韩瑞)¹, Dong Zhou(周栋)¹, Minggang Zhu(朱明刚)^1,2, Wei Li(李卫)^1,2, Wei Sun(孙威)²

1 Division of Functional Materials Research, Central Iron and Steel Research Institute, Beijing 100081, China;
2 National Engineering Research Center for Magnetic Materials, Beijing 102600, China

Received:2018-10-10 Revised:2019-01-09 Online:2019-03-05 Published:2019-03-05
Contact: Shengzhi Dong E-mail:dong_shengzhi@163.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51590882 and 51871063).

摘要/Abstract

摘要：

Single-grain models with different cerium contents or structural parameters have been introduced to investigate the reversal magnetization behaviors in cerium-containing magnets. All the micromagnetic simulations are carried out via the object oriented micromagnetic framework (OOMMF). As for single (Nd,Ce)₂Fe₁₄B type grain, the coercivity decreases monotonously with the increase of the cerium content. Four types of grain structure have been compared:single (Nd,Ce)₂Fe₁₄B type, core ((Nd,Ce)₂Fe₁₄B)-shell (Nd₂Fe₁₄B) type with 2 nm thick shell, core (Ce₂Fe₁₄B)-shell (Nd₂Fe₁₄B) type, and core (Nd₂Fe₁₄B)-shell (Ce₂Fe₁₄B) type. It is found that core ((Nd,Ce)₂Fe₁₄B)-shell (Nd₂Fe₁₄B) type grain with 2 nm thick shell always presents the largest coercivity under the same total cerium content. Furthermore, the relationship between the coercivity and the shell thickness t in core ((Nd,Ce)₂Fe₁₄B)-shell (Nd₂Fe₁₄B) type grain has been studied. When the total cerium content is kept at 20.51 at.%, the analyzed results show that as t varies from 1 nm to 7 nm, the coercivity gradually ascends at the beginning, then quickly descends after reaching the maximum value when t=5 nm. From the perspective of the positions of nucleation points, the reasons why t affects the coercivity are discussed in detail.

关键词: micromagnetic simulation, cerium-containing magnets, core-shell structure, coercivity

Abstract:

Key words: micromagnetic simulation, cerium-containing magnets, core-shell structure, coercivity

中图分类号: (Micromagnetic simulations ?)

75.78.Cd

75.50.Ww (Permanent magnets) 75.78.-n (Magnetization dynamics)

李磊, 董生智, 陈红升, 姜瑞姣, 李栋, 韩瑞, 周栋, 朱明刚, 李卫, 孙威. Micromagnetic simulations of reversal magnetization in cerium-containing magnets[J]. 中国物理B, 2019, 28(3): 37502-037502.

Lei Li(李磊), Shengzhi Dong(董生智), Hongsheng Chen(陈红升), Ruijiao Jiang(姜瑞姣), Dong Li(李栋), Rui Han(韩瑞), Dong Zhou(周栋), Minggang Zhu(朱明刚), Wei Li(李卫), Wei Sun(孙威). Micromagnetic simulations of reversal magnetization in cerium-containing magnets[J]. Chin. Phys. B, 2019, 28(3): 37502-037502.

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Micromagnetic simulations of reversal magnetization in cerium-containing magnets

Micromagnetic simulations of reversal magnetization in cerium-containing magnets

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