Perpendicular spin valves with ultrathin ferromagnetic layers: Magnetoelectronic circuit investigation of finite-size effects
Perpendicular spin valves with ultrathin ferromagnetic layers: Magnetoelectronic circuit investigation of finite-size effects
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DOI：
10.1103/physrevb.73.054407
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发表时间：
2005-04
影响因子：
3.7
通讯作者：
A. Kovalev;G. Bauer;A. Brataas
中科院分区：
文献类型：
--
作者：
A. Kovalev;G. Bauer;A. Brataas
我们研究了铁磁层和普通金属层多层垂直输运中的两个有限尺寸效应：当输运性质取决于磁层厚度时，其量级大于或小于自旋翻转扩散长度；当磁层厚度接近磁相干长度时，其对垂直于磁化极化的自旋电流变得透明。利用磁电子电路理论研究了垂直自旋阀中角磁阻aMR和自旋传递转矩的影响。我们分析了最近的aMR实验，以确定铁磁坡莫合金中的自旋翻转扩散长度和PyCo界面的自旋混合电导，并提出了一种测量铁磁相干长度的方法。
We address two finite-size effects in perpendicular transport through multilayers of ferromagnetic and normal metal layers: i the transport properties depend on the magnetic layer thickness when of the order or thinner than the spin-flip diffusion length and ii magnetic layers with thickness approaching the magnetic coherence length become transparent for spin currents polarized perpendicular to the magnetization. We use magnetoelectronic circuit theory to investigate both effects on angular magnetoresistance aMR and spintransfer torque in perpendicular spin valves. We analyze recent aMR experiments to determine the spin-flip diffusion length in the ferromagnet permalloy as well as the PyCo interface spin-mixing conductance and propose a method to measure the ferromagnetic coherence length.