Large anisotropic deformation of skyrmions in strained crystal
Large anisotropic deformation of skyrmions in strained crystal
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DOI：
10.1038/nnano.2015.113
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发表时间：
2015-07-01
影响因子：
38.3
通讯作者：
Tokura, Y.
中科院分区：
文献类型：
--
作者：
Shibata, K.;Iwasaki, J.;Tokura, Y.
磁性的机械控制是自旋电子学中一种重要且有前途的方法。迄今为止，应变控制主要通过利用磁晶各向异性的变化在铁磁结构中得到证明。期望对磁性纳米结构实现大应变效应。在这里，我们使用原位洛伦兹透射电子显微镜证明，FeGe 手性磁体中小至 0.3% 的各向异性应变会引起磁性斯格明子 (1,2) 发生非常大的变形，以及斯格明子晶格约 20% 的扭曲。斯格明子通过源于手性晶体结构的 Dzyaloshinskii-Moriya 相互作用 (3,4) 来稳定。我们的结果表明，相对于施加应变导致的晶格变化，这种相互作用强度的调节变化被放大了两个数量级。我们的研究结果可能提供一种基于 Dzyaloshinskii-Moriya 相互作用实现拓扑磁结构应变控制的机制。
Mechanical control of magnetism is an important and promising approach in spintronics. To date, strain control has mostly been demonstrated in ferromagnetic structures by exploiting a change in magnetocrystalline anisotropy. It would be desirable to achieve large strain effects on magnetic nanostructures. Here, using in situ Lorentz transmission electron microscopy, we demonstrate that anisotropic strain as small as 0.3% in a chiral magnet of FeGe induces very large deformations in magnetic skyrmions(1,2), as well as distortions of the skyrmion crystal lattice on the order of 20%. Skyrmions are stabilized by the Dzyaloshinskii-Moriya interaction(3,4), originating from a chiral crystal structure. Our results show that the change in the modulation of the strength of this interaction is amplified by two orders of magnitude with respect to changes in the crystal lattice due to an applied strain. Our findings may provide a mechanism to achieve strain control of topological magnetic structures based on the Dzyaloshinskii-Moriya interaction.