论文标题
电流引起的成核和零场天空的运动
Current-induced nucleation and motion of zero field skyrmion
论文作者
论文摘要
我们研究了在没有应用磁场的情况下，研究磁性超薄膜中天空的稳定和电操作。我们表明，与通常的天空样品相比，这需要增加的磁各向异性，并由样品厚度控制，因此均匀的状态对应于零田地状态，而Skyrmions则与亚稳态激发相对应。尽管在广泛的厚度上证明了零场的天际稳定，但电气控制似乎更要求避免天空变形。在最薄的样品中，大型磁各向异性阻止了天际变形，我们表明它们可以通过电流脉冲逐渐成核，这强调了唯一可能的过渡发生在统一和天际态之间。与场稳定的磁场相比，零施加磁场的孤子天空属具有相同的性能，当通过自旋轨道扭矩激发时，具有长期稳定性和高迁移率。
We study the stabilization and electrical manipulation of skyrmions in magnetic ultrathin films in the absence of an applied magnetic field. We show that this requires an increased magnetic anisotropy, controlled by the sample thickness, as compared to usual skyrmionic samples, so that the uniform state corresponds to the zero field ground state and the skyrmions to metastable excitations. Although skyrmion stabilization at zero field is demonstrated over a broad range of thicknesses, electrical control appeared to be more demanding to avoid skyrmion deformation. In the thinnest samples, the large magnetic anisotropy prevents skyrmion deformations and we show that they can be nucleated progressively by current pulses, which underlines that the only possible transition occurs between uniform and skyrmion states. The solitonic skyrmions in zero applied magnetic field have the same properties as compared to field stabilized ones, with a long-term stability and high mobility when excited by a spin-orbit torque.
