arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2204.04439cond-mat.mes-hallphysics.app-ph
收藏

各向异性梯度中的Skyrmion袋

The skyrmion bags in an anisotropy gradient

Zhaozhuo Zeng, Nasir Mehmood, Yunxu Ma, Jianing Wang, Jianbo Wang, Qingfang Liu

摘要:

具有任意拓扑电荷的自旋织构Skyrmion包有望成为赛道存储器中的载流子。在这里,我们从理论上和数值上研究了各向异性梯度中skyrmion袋的动力学。结果表明,在没有边界势的情况下,Skyrmion袋的动力学行为依赖于自旋织构,并且含有$Q = 0$的Skyrmion袋的运动速度比其它Skyrmion袋的运动速度快.而当Skyrmion囊沿边界运动时,所有具有不同$Q$的Skyrmion囊的速度是相同的。这可归因于相同的$u/η_{xx}$值,其中$u$和$η_{xx}$是与skyrmion袋的磁化分布相关的项。此外,我们还利用Thiele方法从理论上推导了这两种情况下Skyrmion袋的动力学,并讨论了Thiele方程的适用范围。在一定范围内,模拟结果与解析计算结果吻合较好。我们的发现提供了一种基于skyrmion袋操纵赛道记忆的替代方法。

英文摘要:

Skyrmion bags as spin textures with arbitrary topological charge are expected to be the carriers in racetrack memory. Here, we theoretically and numerically investigated the dynamics of skyrmion bags in an anisotropy gradient. It is found that, without the boundary potential, the dynamics of skyrmion bags are dependent on the spin textures, and the velocity of skyrmionium with $Q = 0$ is faster than other skyrmion bags. However, when the skyrmion bags move along the boundary, the velocities of all skyrmion bags with different $Q$ are same. This can be attributed to the same value of $u/η_{xx}$, where the $u$ and $η_{xx}$ are the terms related to the magnetization distribution of skyrmion bag. In addition, we theoretically derived the dynamics of skyrmion bags in the two cases using the Thiele approach and discussed the scope of Thiele equation. Within a certain range, the simulation results are in good agreement with the analytically calculated results. Our findings provide an alternative way to manipulate the racetrack memory based on the skyrmion bags.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑