Skyrmions in anisotropic magnetic fields: strain and defect driven dynamics
Skyrmions in anisotropic magnetic fields: strain and defect driven dynamics
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DOI：
10.1557/adv.2019.43
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发表时间：
2019-01-01
期刊：
影响因子：
0.8
通讯作者：
Hesjedal, Thorsten
中科院分区：
文献类型：
--
作者：
Brearton, Richard;Olszewski, Maciej W.;Hesjedal, Thorsten
磁性Skyrmions是粒子状的，拓扑保护的磁化实体，是有希望的候选人的信息载体在赛道存储器计划。以类似移位寄存器的方式传输skyrmions对于它们在实际设备中的体现至关重要。最近，我们通过实验证明，在Cu 2 OSeO 3的手性skyrmion可以有效地操纵磁场梯度，导致集体旋转的skyrmion晶格与定义明确的动态在径向场梯度。在这里，我们采用一个skyrmion粒子模型数值研究的结果剪切力的skyrmion晶格的结构上的影响。我们表明，各向异性峰加宽实验观察到的衍射图案可以归因于扩展的线性区域中的磁场分布。我们发现，拓扑（5-7）缺陷出现，以保护在局部剪切力的应用下的晶格的六重对称性，进一步提高了稳定性的磁场驱动设备。
Magnetic skyrmions are particle-like, topologically protected magnetization entities that are promising candidates for information carriers in racetrack-memory schemes. The transport of skyrmions in a shift-register-like fashion is crucial for their embodiment in practical devices. Recently, we demonstrated experimentally that chiral skyrmions in Cu2OSeO3 can be effectively manipulated by a magnetic field gradient, leading to a collective rotation of the skyrmion lattice with well-defined dynamics in a radial field gradient. Here, we employ a skyrmion particle model to numerically study the effects of resultant shear forces on the structure of the skyrmion lattice. We demonstrate that anisotropic peak broadening in experimentally observed diffraction patterns can be attributed to extended linear regions in the magnetic field profile. We show that topological (5-7) defects emerge to protect the six-fold symmetry of the lattice under the application of local shear forces, further enhancing the stability of proposed magnetic field driven devices.