Field-driven evolution of chiral spin textures in a thin helimagnet nanodisk
Field-driven evolution of chiral spin textures in a thin helimagnet nanodisk
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薄螺旋磁体纳米盘中手性自旋纹理的场驱动演化
DOI：
10.1103/physrevb.87.014401
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发表时间：
2013-01-02
影响因子：
3.7
通讯作者：
Zhang, Yuheng
中科院分区：
文献类型：
--
作者：
Du, Haifeng;Ning, Wei;Zhang, Yuheng
用蒙特卡罗模拟方法研究了不同尺寸的螺旋网状纳米薄盘中手性自旋织构的磁场驱动演化。结果表明，这种复杂的自旋织构可以简单地看作平面内自旋取向垂直或平行于边缘的边缘态和具有类似于二维手性磁性薄膜特征的体态的叠加。随着外场的增加，边缘态的平行自旋比例增加，自旋织构最终转变为边缘磁涡。Skyrmions的排列强烈地依赖于磁盘的大小。此外，在一定范围内的单轴各向异性和偶极耦合能够稳定具有天芯的特殊磁涡，而盘的大小与螺旋态的波长相当。
The magnetic field-driven evolution of chiral spin textures in thin helimagnet nanodisk with varied size are investigated by means of Monte Carlo simulation. It is demonstrated that the complex spin texture may simply be regarded as the superposition of the edged state with in plane spin orientation perpendicular or parallel to the edge and the bulk state with the features similar to two-dimensional chiral magnetic films. With the increase of the external field, the proportion of the parallel spins of the edge state increases, and the spin textures finally transfers into edged magnetic vortex. The arrangement of skyrmions strongly depends on the disk size. In addition, the uniaxial anisotropy and dipolar coupling in certain ranges are able to stabilize a special magnetic vortex with Skyrmionic core while the disk size is comparable with the wavelength of helix state.