Ce1.66Mg1.34Co3和α″-Fe16N2多层梯度膜磁反转性质的微磁学模拟

doi:10.19596/j.cnki.1001-246x.8709

摘要/Abstract

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_1.66Mg_1.34Co₃和α″-Fe₁₆N₂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。

关键词: 多层梯度膜, 矫顽力, 微磁学模拟, 磁化反转

Abstract:

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_1.66Mg_1.34Co₃ and α″-Fe₁₆N₂ 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.

Key words: multilayer gradient films, coercivity, micromagnetic simulation, magnetization inversion

中图分类号:

O469

陈立谦, 张素英. Ce_1.66Mg_1.34Co₃和α″-Fe₁₆N₂多层梯度膜磁反转性质的微磁学模拟[J]. 计算物理, 2024, 41(2): 239-244.

Liqian CHEN, Suying ZHANG. Micromagnetic Simulation of Magnetic Inversion Properties of Ce_1.66Mg_1.34Co₃ and α″-Fe₁₆N₂ Multilayer Gradient Films[J]. Chinese Journal of Computational Physics, 2024, 41(2): 239-244.

图/表 7

图1 不同梯度下Ce1.66Mg1.34Co3和α″-Fe16N2交换耦合梯度膜模型(立体图和二维图)

Fig.1 Ce1.66Mg1.34Co3 and α″-Fe16N2 exchange coupled gradient film models in different gradients (stereogram and two-dimensional diagram)

表1 硬磁相Ce1.66Mg1.34Co3和软磁相α″-Fe16N2的磁性参数

Table 1 Magnetic parameters of hard magnetic Ce1.66Mg1.34Co3 and soft magnetic α″-Fe16N2

Phase	M_s/(A·m^-1)	K/(J·m ^-3)	A_ex/(J·m^-1)
Ce_1.66Mg_1.34Co₃	3.0 × 10⁵	7 × 10⁵	1.13 × 10^-11
α″-Fe₁₆N₂	2.235 × 10⁶	2.5 × 10⁵	3.25 × 10^-11

图2 不同梯度结构下多层交换耦合梯度膜的磁滞回线

Fig.2 Hysteresis loops of multilayer exchange coupled gradient films with different gradient structures

图3 不同梯度结构下耦合梯度膜的的磁能积

Fig.3 Magnetic energy product of coupled gradient films with different gradient structures

图4 多层交换耦合梯度膜的磁矩分布图(x-y面视图, 从左到右分别是硬磁层截面、硬软磁层界面、软磁层截面。箭头为蓝色代表与初始的磁化方向相同，红色则相反。)(a) H=3 T；(b) H=1.45 T；(c) H=1.35 T；(d) H=1.21 T；(e) H=0.38 T；(f) H=-0.29 T；(g) H=-0.54 T；(h) H=-0.60 T；(i) H=-1.28 T

Fig.4 Magnetic moment distribution of multilayer exchange coupled gradient films (x-y plane view, from left to right, hard magnetosphere cross section, hard and soft magnetosphere interface, soft magnetosphere cross section. Blue arrows represent the same direction as the initial magnetization, red arrows are the opposite.) (a) H=3 T; (b) H=1.45 T; (c) H=1.35 T; (d) H=1.21 T; (e) H=0.38 T; (f) H=-0.29 T; (g) H=-0.54 T; (h) H=-0.60 T; (i) H=-1.28 T

图5 多层交换耦合梯度膜在H=-0.54 T时硬软磁交界面处的磁矩二维分布(x-y面视图)

Fig.5 Two-dimensional distribution of magnetic moments at the hard-soft magnetic interface of multilayer exchange coupled gradient films at H=- 0.54 T (x-y plane view)

图6 耦合梯度膜磁化过程中的各项能量

Fig.6 Variations of various energies during the magnetization process of coupled gradient films

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[1]	张光富, 张赛文, 邓杨保, 熊翠秀, 谭伟石. 电流驱动凹槽磁纳米带内斯格明子的移动特性[J]. 计算物理, 2021, 38(2): 199-205.
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[3]	柳艳, 李化南, 胡勇, 杜安. 具有尺寸限制的点接触结构自旋极化电流驱动下磁涡旋的稳态振荡[J]. 计算物理, 2013, 30(6): 915-920.

Ce_1.66Mg_1.34Co₃和α″-Fe₁₆N₂多层梯度膜磁反转性质的微磁学模拟

Micromagnetic Simulation of Magnetic Inversion Properties of Ce_1.66Mg_1.34Co₃ and α″-Fe₁₆N₂ Multilayer Gradient Films

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