Phase structure evolution and coercivity mechanism of high-Co containing permanent magnets

作     者：Min Huang Yong Ding Zhihe Zhao Chunguo Wang Bo Zhou Lei Liu Yingli Sun Aru Yan 黄敏;丁勇;赵之赫;王春国;周波;刘雷;孙颖莉;闫阿儒

作者机构：CISRI & NIMTE Joint Innovation Center for Rare Earth Permanent MagnetsCAS Key Laboratory of Magnetic Materials and DevicesZhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China University of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2024年第33卷第11期

页      面：403-410页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：Project supported by National Key R&D Program of China(Grant No.2021YFB3803003) Youth Innovation Promotion Association CAS(Grant No.2023311) 

主　　题：Co-rich phase pinning coercivity mechanism high-Co containing magnets 

摘      要：The phase structure and magnetic properties of high-Co containing permanent magnets with high thermal stability have been systematically studied in this *** is abnormal that the coercivity of annealed samples was slightly lower than that of sintered samples,while the coercivity was usually enhanced after annealing in conventional Nd–Fe–B *** analysis showed that in addition to RE2(Fe,Co)14B main phase and RE-rich grain boundary phase,there were also new Co-rich magnetic phases located in the grain *** annealing,the phase structures of high-Co containing magnets were readjusted,especially the increasing Co-rich magnetic phase and emerging RE-rich particles precipitated from the main ***,the isolated RE-rich particles would act as the pinning center of the domain wall movement in demagnetization *** was confirmed that the coercivity of annealed high-Co containing magnets was controlled by both nucleation and *** mechanism can partially compensate for the weakening of magnetic isolation due to increased Co-rich magnetic phase,which explained the moderate decrease in coercivity of annealed high-Co containing *** discovery of new coercivity mechanism contributed to in-depth understanding of high-Co containing magnets.