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Chin. Phys. B, 2019, Vol. 28(3): 037502    DOI: 10.1088/1674-1056/28/3/037502
Special Issue: Virtual Special Topic — Magnetism and Magnetic Materials

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

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.

Keywords:  micromagnetic simulation      cerium-containing magnets      core-shell structure      coercivity  
Received:  10 October 2018      Revised:  09 January 2019      Accepted manuscript online: 
PACS:  75.78.Cd (Micromagnetic simulations ?)  
  75.50.Ww (Permanent magnets)  
  75.78.-n (Magnetization dynamics)  

Project supported by the National Natural Science Foundation of China (Grant Nos. 51590882 and 51871063).

Corresponding Authors:  Shengzhi Dong     E-mail:

Cite this article: 

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 2019 Chin. Phys. B 28 037502

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