Exchange interaction and demagnetization process of high-abundance rare-earth magnets sintered using dual alloy method  

作　　者：Dan Liu Tongyun Zhao Jiaying Jin Tianyu Ma Jiefu Xiong Baogen Shen Fengxia Hu Jirong Sun 

机构地区：[1]Department of Physics,School of Artificial Intelligence,Beijing Technology and Business University,Beijing 100048,China [2]Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341000,China [3]State Key Laboratory of Magnetism,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [4]School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2022年第4期104-111,共8页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Beijing Natural Science Foundation(Grant No.2214070);Science Center of the National Science Foundation of China(Grant No.52088101);National Natural Science Foundation of China(Grant Nos.52001012,51901057,U1832219,51771223,and 51971240);Heye Chongming Project(Grant No.HYCMP-2021001);National Key Research and Development Program of China(Grant Nos.2021YFB3501202,2021YFB35015043,2020YFA0711502,2019YFA0704900,2018YFA0305704,and 2017YFA0303601);Key Projects of Capacity Construction of Science and Technology Innovation Service(Grant No.19002020124);Beijing Talent Training Quality Construction Project(Grant No.19008021064);Strategic Priority Research Program B(Grant No.XDB33030200);Key Program of the Chinese Academy of Sciences(CAS)。

摘　　要：The 2:14:1-type rare-earth(RE)-Fe-B permanent magnets prepared by the dual alloy method have been found to possess much superior magnetic properties to those prepared by the single alloy method,providing an appealing route to promote the utilization of high-abundance RE elements Ce and La and balance the use of the RE source.However,the relationship between magnetic interactions among different 2:14:1 main phases and superior magnetic properties is still unclear.In this study,we investigated the magnetic interactions and reversal field distribution in these magnets using first-order reversal curve(FORC)images.The FORC images showed that(Nd,Pr)27.8(La,Ce)2.7FebalM1.4B1.0(S-9)and(Nd,Pr)19.5(La,Ce)11.0FebalM1.4B1.0(S-36)have the characteristics of multiple main phases.The reverse magnetic fields corresponding to the soft and hard main phases,as well as the associated exchange coupling,were highly dependent on the La Ce content.The higher the La Ce content,the weaker the exchange coupling and the more asynchronous the demagnetization process.In addition,the FORC images indicated that the magnetization reversal process also varies with La Ce content,where the nucleation and propagation of reversed domains dominant in the S-9 magnet,while the domain propagation in the S-36 magnet is considerably suppressed.Additional micromagnetic simulations also revealed that the coercivity and exchange coupling of multi-main-phase magnets decrease with increasing La Ce content,correlating well with the experimental results.These findings may not only contribute to a better understanding of the complex magnetic interactions between the soft and hard phases and how they affect macroscopic magnetic properties but also help in improving the magnetic performance of the RE-Fe-B magnets with high La Ce content.

关 键 词：permanent magnets exchange interaction first-order reversal curve MICROMAGNETISM high abundance rare-earth magnets 

分 类 号：O469[理学—凝聚态物理]