Static and dynamic characteristics of magnetism in permalloy oval nanoring by micromagnetic simulation
Static and dynamic characteristics of magnetism in permalloy oval nanoring by micromagnetic simulation
复制标题
微磁模拟坡莫合金椭圆纳米环磁性的静态和动态特性
DOI：
10.1016/j.jmmm.2018.11.049
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发表时间：
2019
影响因子：
2.7
通讯作者：
Liu Zhongyuan
中科院分区：
文献类型：
--
作者：
Mu Congpu;Jing Juntong;Dong Jiyu;Wang Weiwei;Xu Jianghong;Nie Anmin;Xiang Jianyong;Wen Fusheng;Liu Zhongyuan
由于其在磁存储方面的潜在应用，涡旋磁化结构引起了人们的广泛关注，在许多磁性纳米结构中都发现了这种结构。本文通过微磁模拟研究了不同厚度和臂宽的坡莫合金椭圆纳米环的静态和动态磁性特性。在椭圆形纳米环中发现了两种磁化构型（涡旋态和洋葱态），并且涡旋态是稳定状态。洋葱虽然处于亚稳态，但随着厚度的减小而变得更加稳定。模拟了沿椭圆形纳米环长轴的磁滞回线，并研究了矫顽力作为臂宽和厚度的函数。矫顽力随着厚度的增加先增大后减小。同时，针对不同的臂宽和厚度，模拟了椭圆形纳米环中涡旋态的动态磁化率。当厚度大于25nm时，可以发现均匀共振模式和边缘共振模式。然而，厚度小于20nm的椭圆形纳米环存在单一均匀共振模式。当厚度从4纳米变化到100纳米时，谐振频率可以在8.2-13.7GHz范围内显着调制。
Due to its potential application in magnetic memory, the vortex magnetization configuration has drawn much attention, which had been found in many magnetic nanostructure. In this paper, static and dynamic characteristics of magnetism in permalloy oval nanoring are investigated with varying thickness and arm width via micromagnetic simulation. Two magnetization configuration (vortex and onion states) were found in oval nanoring and the vortex state is a stable state. Although onion is a metastable state, it become more stable with the decrease of thickness. The magnetic hysteresis loop along long axis of oval nanoring is simulated and coercive forces are investigated as function of arm width and thickness. Coercive force increases firstly and then decrease with the increase of thickness. In meanwhile, the dynamic magnetic susceptibility of vortex state in oval nanoring is simulated for varying arm width and thickness. Uniform resonance mode and edge resonance mode can be found when thickness is above 25 nm. However, there is a single uniform resonance mode in oval nanoring with thickness less 20 nm. The resonance frequency can be significantly modulated in the region of 8.2–13.7 GHz when thickness changes from 4 to 100 nm.