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Emerging nonequilibrium bound state in spin-current-local-spin scattering

机译:自旋电流-局部自旋散射中的新兴非平衡束缚态

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摘要

Magnetization reversal is a well-studied problem with obvious applicability in computer hard drives. One can accomplish a magnetization reversal in at least one of two ways: application of a magnetic field or through a spin current. The latter is more amenable to a fully quantum-mechanical analysis. We formulate and solve the problem whereby a spin current interacts with a ferromagnetic Heisenberg spin chain, to eventually reverse the magnetization of the chain. Spin flips are accomplished through both elastic and inelastic scattering. A consequence of the inelastic-scattering channel, when it is no longer energetically possible, is the occurrence of a nonequilibrium bound state, which is an emergent property of the coupled local plus itinerant spin system. For certain definite parameter values the itinerant spin lingers near the local spins for some time, before eventually leaking out as an outwardly diffusing state. This phenomenon results in spin-flip dynamics and filtering properties for this type of system.
机译:磁化反转是一个经过充分研究的问题,在计算机硬盘驱动器中具有明显的适用性。一个人可以通过以下两种方式中的至少一种来完成磁化反转:施加磁场或通过自旋电流。后者更适合于完全量子力学分析。我们制定并解决了自旋电流与铁磁海森堡自旋链相互作用以最终逆转链的磁化的问题。自旋翻转是通过弹性和非弹性散射来完成的。当不再有能量可能时,非弹性散射通道的结果就是出现了非平衡束缚态,这是耦合的局部加流动性自旋系统的一种新兴性质。对于某些确定的参数值,迭代器旋转会在局部旋转附近徘徊一段时间,然后最终以向外扩散的状态泄漏出去。这种现象导致这种系统的自旋翻转动力学和滤波特性。

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