Edge-mediated skyrmion chain and its collective dynamics in a confined geometry.
Edge-mediated skyrmion chain and its collective dynamics in a confined geometry.
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边缘介导的斯格明子链及其在有限几何结构中的集体动力学
DOI：
10.1038/ncomms9504
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发表时间：
2015-10-08
影响因子：
16.6
通讯作者：
Tian M
中科院分区：
文献类型：
--
作者：
Du H;Che R;Kong L;Zhao X;Jin C;Wang C;Yang J;Ning W;Li R;Jin C;Chen X;Zang J;Zhang Y;Tian M
一种拓扑学上非平凡的涡旋状磁结构--磁天象的出现，为存储器件带来了新的概念。广泛的研究已经在理论上证明了通过使用一维纳米条纹中的天微子链来编码信息比特的能力。在这里，我们报道了用高分辨率洛伦兹透射电子显微镜对FeGe纳米条中的Skyrmion链进行的实验观察。在外加磁场的作用下，我们观察到具有扭曲边缘自旋的螺旋基态演化成单个的Skyrmions，这些Skyrmions在低场下以链状的形式聚集在一起，在高场下集体移动到纳米条的内部。即使当纳米条纹的宽度比单个天米子的大小大得多时，这样的天米子链仍然存在。这一发现展示了一种通过边缘效应形成天空密子的方法，从长远来看，可能会为潜在的应用提供线索。
The emergence of a topologically nontrivial vortex-like magnetic structure, the magnetic skyrmion, has launched new concepts for memory devices. Extensive studies have theoretically demonstrated the ability to encode information bits by using a chain of skyrmions in one-dimensional nanostripes. Here, we report experimental observation of the skyrmion chain in FeGe nanostripes by using high-resolution Lorentz transmission electron microscopy. Under an applied magnetic field, we observe that the helical ground states with distorted edge spins evolve into individual skyrmions, which assemble in the form of a chain at low field and move collectively into the interior of the nanostripes at elevated fields. Such a skyrmion chain survives even when the width of the nanostripe is much larger than the size of single skyrmion. This discovery demonstrates a way of skyrmion formation through the edge effect, and might, in the long term, shed light on potential applications.