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Chin. Phys. B, 2023, Vol. 32(4): 047504    DOI: 10.1088/1674-1056/ac9359

Micromagnetic study of magnetization reversal in inhomogeneous permanent magnets

Zhi Yang(杨质), Yuanyuan Chen(陈源源), Weiqiang Liu(刘卫强), Yuqing Li(李玉卿),Liying Cong(丛利颖), Qiong Wu(吴琼), Hongguo Zhang(张红国), Qingmei Lu(路清梅), Dongtao Zhang(张东涛), and Ming Yue(岳明)
Faculty of Materials and Manufacturing, Key Laboratory of Advanced Functional Materials(Ministry of Education), Beijing University of Technology, Beijing 100124, China
Abstract  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.
Keywords:  permanent magnets      micromagnetic simulation      exchange-coupling      multilayers  
Received:  10 July 2022      Revised:  06 September 2022      Accepted manuscript online:  21 September 2022
PACS:  75.78.Cd (Micromagnetic simulations ?)  
  75.78.-n (Magnetization dynamics)  
  75.90.+w (Other topics in magnetic properties and materials)  
Fund: Project supported by the National Key R&D Program of China (Grant No. 2021YFB3500300), the National Natural Science Foundation of China (Grant Nos. 51931007 and 51871005), the Program of Top Disciplines Construction in Beijing (Grant No. PXM2019 014204 500031), 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), and Chaoyang District Postdoctoral Research Foundation.
Corresponding Authors:  Weiqiang Liu, Ming Yue     E-mail:;

Cite this article: 

Zhi Yang(杨质), Yuanyuan Chen(陈源源), Weiqiang Liu(刘卫强), Yuqing Li(李玉卿), Liying Cong(丛利颖), Qiong Wu(吴琼), Hongguo Zhang(张红国), Qingmei Lu(路清梅), Dongtao Zhang(张东涛), and Ming Yue(岳明) Micromagnetic study of magnetization reversal in inhomogeneous permanent magnets 2023 Chin. Phys. B 32 047504

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