交流自旋阀效应理论
Theory of the ac spin-valve effect
摘要：
在自旋注入的漂移扩散（标准）模型下，研究了对称铁磁体/正常金属/铁磁体结的自旋阀复磁阻抗。交流磁电阻-平行和反平行磁化配置的阻抗的实部差-表现出整体阻尼振荡行为，作为扩散和自旋弛豫时间的相互作用。在宽结的交流磁阻振荡之间的正值和负值，反映共振放大和耗尽的自旋积累，而薄隧道结的线形预测是纯粹的洛伦兹。交流自旋阀效应可以是一种在没有磁场和固定样品尺寸的情况下提取自旋输运和自旋弛豫参数的技术。
英文摘要：
The spin-valve complex magnetoimpedance of symmetric ferromagnet/normal metal/ferromagnet junctions is investigated within the drift-diffusion (standard) model of spin injection. The ac magnetoresistance---the real part difference of the impedances of the parallel and antiparallel magnetization configurations---exhibits an overall damped oscillatory behavior, as an interplay of the diffusion and spin relaxation times. In wide junctions the ac magnetoresistance oscillates between positive and negative values, reflecting resonant amplification and depletion of the spin accumulation, while the line shape for thin tunnel junctions is predicted to be purely Lorentzian. The ac spin-valve effect could be a technique to extract spin transport and spin relaxation parameters in the absence of a magnetic field and for a fixed sample size.
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