Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.
Phys Rev Lett. 2014 Jun 6;112(22):227201. doi: 10.1103/PhysRevLett.112.227201. Epub 2014 Jun 2.
Superfluid spin transport-dissipationless transport of spin-is theoretically studied in a ferromagnetic insulator with easy-plane anisotropy. We consider an open geometry where the spin current is injected into the ferromagnet from one side by a metallic reservoir with a nonequilibrium spin accumulation and ejected into another metallic reservoir located downstream. Spin transport is studied using a combination of magnetoelectric circuit theory, Landau-Lifshitz-Gilbert phenomenology, and microscopic linear-response theory. We discuss how spin superfluidity can be probed in a magnetically mediated negative electron-drag experiment.
我们理论研究了具有面各向异性的铁磁绝缘体中超流自旋输运-无耗散输运。考虑了一种开放结构，自旋流由一侧的金属储库通过非平衡自旋积累注入铁磁体，并由下游的另一个金属储库射出。我们利用磁电电路理论、朗道-利夫希茨-吉尔伯特唯象理论和微观线性响应理论的组合来研究自旋输运。我们讨论了如何在磁介导的负电子拖拽实验中探测自旋超流性。
