Micromagnetism simulation on effects of soft phase size on Nd2Fe14B/α-Fe nanocomposite magnet with soft phase imbedded in hard phase

作     者：Yu-Qing Li Ming Yue Yi Pen Hong-Guo Zhang 李玉卿;岳明;彭懿;张红国

作者机构：College of Materials Science and EngineeringBeijing University of TechnologyBeijing 100124China 

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

年 卷 期：2018年第27卷第8期

页      面：529-534页

核心收录：

学科分类：07[理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 0702[理学-物理学] 

基　　金：Project supported by the Key Program of the National Natural Science Foundation of China(Grant No.51331003) the International S&T Cooperation Program of China(Grant No.2015DFG52020) the General Program of Science and Technology Development Project of Beijing Municipal Education Commission,China(Grant No.KM201710005006) the State Key Laboratory of Advanced Metals and Materials,China(Grant No.2015-ZD02) 

主　　题：micromagnetism simulation magnetization dynamics, Nd2Fe14B/a-Fe nanocomposite magnets 

摘      要：In this study, micromagnetism simulation by using timte dltterence method is cameo out on the Ncl21-el415/a-Fe nanocomposite magnet with soft phase imbedded in hard phase. The effects of soft magnetic phase size （S） on the magnetic properties and magnetic reversal modes are systematically analyzed. As S increases from 1 nm to 48 nm, the remanence （Jr） increases, while the coercivity （Hci） decreases, leading to the result that the magnetic energy prod- uct [（BH）max] first increases slowly, and then decreases rapidly, peaking at S = 24 nm with the （BH）max of 72.9 MGOe （1 MGOe = 7.95775 kJ.m-3）. Besides, with the increase of S, the coercivity mechanism of the nanocomposite magnet changes from nucleation to pinning. Furthermore, by observing the magnetic moment evolution in demagnetization pro- cess, the magnetic reversal of the soft phase in the nanocomposite magnet can be divided into three modes with the increase of S： coherent rotation （S 〈 3 nm）, quasi-coherent rotation （3 nm≤S 〈 36 nm）, and the vortex-like rotation （S ≥36 nm）.