Micromagnetic study of magnetization reversal in inhomogeneous permanent magnets  

作　　者：杨质 陈源源 刘卫强 李玉卿 丛利颖 吴琼 张红国 路清梅 张东涛 岳明 Zhi Yang;Yuanyuan Chen;Weiqiang Liu;Yuqing Li;Liying Cong;Qiong Wu;Hongguo Zhang;Qingmei Lu;Dongtao Zhang;Ming Yue(Faculty of Materials and Manufacturing,Key Laboratory of Advanced Functional Materials(Ministry of Education),Beijing University of Technology,Beijing 100124,China)

机构地区：[1]Faculty of Materials and Manufacturing,Key Laboratory of Advanced Functional Materials(Ministry of Education),Beijing University of Technology,Beijing 100124,China

出　　处：《Chinese Physics B》2023年第4期646-651,共6页中国物理B（英文版）

基　　金：Project supported by the National Key R&D Program of China(Grant No.2021YFB3500300);the National Natural Science Foundation of China(Grant Nos.51931007and 51871005);the Program of Top Disciplines Construction in Beijing(Grant No.PXM2019014204500031);the International Research Cooperation Seed Fund of Beijing University of Technology(Grant No.2021B23);the Key Program of Science and Technology Development Project of Beijing Municipal Education Commission of China(Grant No.KZ202010005009);General Program of Science and Technology Development Project of Beijing Municipal Education Commission(Grant No.KM202010005009);Chaoyang District Postdoctoral Research Foundation。

摘　　要：Macroscopic magnetic properties of magnets strongly depend on the magnetization process and the microstructure of the magnets.Complex materials such as hard-soft exchange-coupled magnets or just real technical materials with impurities and inhomogeneities exhibit complex magnetization behavior.Here we investigate the effects of size,volume fraction,and surroundings of inhomogeneities on the magnetic properties of an inhomogeneous magnetic material via micromagnetic simulations.The underlying magnetization reversal and coercivity mechanisms are revealed.Three different demagnetization characteristics corresponding to the exchange coupling phase,semi-coupled phase,and decoupled phase are found,depending on the size of inhomogeneities.In addition,the increase in the size of inhomogeneities leads to a transition of the coercivity mechanism from nucleation to pinning.This work could be useful for optimizing the magnetic properties of both exchange-coupled nanomagnets and inhomogeneous single-phase magnets.

关 键 词：permanent magnets micromagnetic simulation EXCHANGE-COUPLING MULTILAYERS 

分 类 号：O469[理学—凝聚态物理]