Polarity control of a skyrmion in a helimagnet nanodisk by fixing magnetization at the boundary
Polarity control of a skyrmion in a helimagnet nanodisk by fixing magnetization at the boundary
复制标题
通过固定边界磁化强度控制旋磁体纳米盘中斯格明子的极性
DOI：
10.1088/1361-6463/aa920a
复制
发表时间：
2017
影响因子：
3.4
通讯作者：
Yan Huan
中科院分区：
文献类型：
--
作者：
Liu Yan;Xuan Shengjie;Jia Min;Yan Huan
我们证明，纳米盘中斯格明子的极性可以通过固定盘边界处的磁化方向来控制。首先，我们从理论上证明固定盘边缘磁化方向可以打破不同极性斯格明子的能量简并性。然后，我们提出了具有不同半径的螺旋磁性纳米盘的基态相图，作为盘边缘磁化方向和各向异性常数的函数。结果表明，随着盘边缘磁化强度与z轴之间的夹角从0增加到2π，斯格明子的极性在p = 1和 −1之间交替变化。最后，我们进行了微磁模拟并验证了计算结果。
We demonstrate that the polarity of a skyrmion in a nanodisk can be controlled by fixing the direction of magnetization at the disk boundary. First, we theoretically demonstrate that fixing the direction of the magnetization at the disk edge can break the energy degeneracy of the skyrmion with different polarities. Then, we present the phase diagrams of the ground state for a helimagnetic nanodisk with different radii as functions of the direction of the magnetization at the disk edge and anisotropy constant. It shows that the polarity of the skyrmion alternately changes between p = 1 and −1 with the angle between the magnetization at the disk edge and z-axis increasing from 0 to 2π. Finally, we conduct the micromagnetic simulations and confirm the calculation results.