Strain-mediated voltage-controlled switching of magnetic skyrmions in nanostructures
Strain-mediated voltage-controlled switching of magnetic skyrmions in nanostructures
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DOI：
10.1038/s41524-018-0119-2
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发表时间：
2018-11-21
影响因子：
9.7
通讯作者：
Chen, Long-Qing
中科院分区：
文献类型：
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作者：
Hu, Jia-Mian;Yang, Tiannan;Chen, Long-Qing
磁skyrmions是旋涡自旋结构，通常由Dyzaloshinskii-Moriya相互作用稳定。现有的磁陀螺控制通常依赖于电流的使用，这可能会导致密集包装的设备过热。在这里，我们证明，使用相场模拟，一个孤立的尼尔斯基米子在磁性纳米盘中可以反复创建和删除电压诱导应变从一个并列的压电。这种skyrmion开关是非易失性的，并且每次开关的功耗仅为0.5 fJ，这比电流诱导的自旋转移扭矩小了大约5个数量级。研究发现，应变介导的skyrmion产生是通过中间的涡状自旋结构发生的，skyrmion的删除是通过均匀收缩发生的，在此过程中Neel壁暂时转变为涡壁。这些发现有望刺激对应变介导的skyrmions电压控制的实验研究，以及其他低功率自旋电子学的手性自旋结构。
Magnetic skyrmions are swirling spin structures stabilized typically by the Dyzaloshinskii-Moriya interaction. The existing control of magnetic skyrmions has often relied on the use of an electric current, which may cause overheating in densely packed devices. Here we demonstrate, using phase-field simulations, that an isolated Neel skyrmion in a magnetic nanodisk can be repeatedly created and deleted by voltage-induced strains from a juxtaposed piezoelectric. Such a skyrmion switching is non-volatile, and consumes only similar to 0.5 fJ per switching which is about five orders of magnitude smaller than that by current-induced spin-transfer-torques. It is found that the strain-mediated skyrmion creation occurs through an intermediate vortex-like spin structure, and that the skyrmion deletion occurs though a homogenous shrinkage during which the Neel wall is temporarily transformed to a vortex-wall. These findings are expected to stimulate experimental research into strain-mediated voltage control of skyrmions, as well as other chiral spin structures for low-power spintronics.