Ce_(1.66)Mg_(1.34)Co_(3)和α″-Fe_(16)N_(2)多层梯度膜磁反转性质的微磁学模拟  

Micromagnetic Simulation of Magnetic Inversion Properties of Ce_(1.66)Mg_(1.34)Co_(3)andα″-Fe_(16)N_(2)Multilayer Gradient Films

作　　者：陈立谦 张素英[1] CHEN Liqian;ZHANG Suying(Institute of Theoretical Physics,Shanxi University,Taiyuan,Shanxi 030006,China)

机构地区：[1]山西大学理论物理研究所,山西太原030006

出　　处：《计算物理》2024年第2期239-244,共6页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(11772177);山西省自然科学基金(202203021211310)资助项目。

摘　　要：为了改善永磁薄膜的磁性能,基于微磁学理论,使用编程软件OOMMF针对Ce_(1.66)Mg_(1.34)Co_(3)和α″-Fe_(16)N_(2)交换耦合多层梯度膜的磁化过程进行模拟,系统研究磁晶各向异性梯度对多层膜性能的影响,分析体系的剩余磁化强度、矫顽力、磁滞回线和磁化反转过程中的能量变化。研究表明:减小磁晶各向异性梯度或增加界面处磁晶各向异性的差值,可以有效提高薄膜的矫顽力和剩余磁化强度,从而改善磁性能。通过计算磁矩分布发现一种磁涡旋态,这种磁涡旋态的产生过程伴随系统能量的增加。In order to improve the magnetic properties of permanent magnet films,based on the theory of micromagnetism,we have studied the magnetization properties of Ce_(1.66)Mg_(1.34)Co_(3)andα″-Fe_(16)N_(2)exchange coupled multilayer gradient films by using software OOMMF,and the influence of magnetic crystal anisotropy gradient on the properties of multilayer films systematically.We analyze the changes of remanence,coercivity,hysteresis loop and energy during magnetization reversal process.We find that the coercivity and residual magnetization of the films can be effectively increased by decreasing the anisotropic gradient of magnetic crystals or increasing the anisotropy difference at the interface,so as to improve the magnetic properties.A magnetic vortex state is found by calculating the magnetic moment distribution,and the generation of this magnetic vortex state is accompanied by the increase of system energy.

关 键 词：多层梯度膜 矫顽力 微磁学模拟 磁化反转 

分 类 号：O469[理学—凝聚态物理]