Self-stabilizing exchange-mediated spin transport
Self-stabilizing exchange-mediated spin transport
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DOI：
10.1103/physrevb.103.144412
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发表时间：
2021-04
影响因子：
3.7
通讯作者：
T. Schneider;D. Hill;A. Kákay;K. Lenz;J. Lindner;J. Fassbender;P. Upadhyaya;Yuxiang Liu;Kang L. Wang;Y. Tserkovnyak;I. Krivorotov;I. Barsukov
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文献类型：
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作者：
T. Schneider;D. Hill;A. Kákay;K. Lenz;J. Lindner;J. Fassbender;P. Upadhyaya;Yuxiang Liu;Kang L. Wang;Y. Tserkovnyak;I. Krivorotov;I. Barsukov
磁性系统中的长程自旋输运可以通过具有鲁棒拓扑缠绕的交换介导自旋织构来实现，这种现象被称为自旋超流性。它的实验特征已经在几乎没有偶极相互作用的反铁磁体中进行了讨论。然而，在具有不可忽略的偶极场的铁磁体中，实现这种自旋输运仍然是一个挑战。利用微磁学模拟，我们研究了扩展铁磁薄膜中的相干交换介导的自旋输运。我们发现了一个双流体状态，在该状态下，自旋纹理的长程自旋输运与自旋波共存，以及在高自旋注入偏压下的孤子屏蔽自旋输运机制。这两个国家都与不同的自旋纹理重建附近的自旋注入区域和维持自旋运输在很大的距离。
Long-range spin transport in magnetic systems can be achieved by means of exchange-mediated spin textures with robust topological winding, a phenomenon referred to as spin superfluidity. Its experimental signatures have been discussed in antiferromagnets, which are nearly free of dipolar interaction. However, in ferromagnets, which possess non-negligible dipole fields, realization of such spin transport has remained a challenge. Using micromagnetic simulations, we investigate coherent exchange-mediated spin transport in extended thin ferromagnetic films. We uncover a two-fluid state in which the long-range spin transport by spin textures coexists with spin waves, as well as a soliton-screened spin transport regime at high spin injection biases. Both states are associated with distinct spin texture reconstructions near the spin injection region and sustain spin transport over large distances.