电流感应磁化翻转效应的改进的系综模型

An improved ensemble model on current induced magnetic switching effect

运用宏观双通道扩散模型研究了赝自旋阀结构中的自旋相关输运过程,考虑到磁化强度矢量的横向分量的影响,建立了自由层磁化强度矢量的动力学方程,利用自旋流连续和化学势差连续作为边界条件.理论计算求解了电流感应磁化翻转效应中的临界电流,解释了铁磁层和非磁层电导率匹配问题和纵向场对电流感应磁化翻转效应中临界电流的影响.

The current induced magnetic switching（CIMS） effect could occur without the magnetic field in nano-scale pseudo-spin valves that have the potential perspective for application in nonvolatile magnetic random access memory.In this paper,spin transport process in the pseudo-spin valve nanopillars has been investigated with macroscopic double conducting channel diffusion model.Dynamic equation of the magnetization of free layer is established with the consideration of the influence of transverse component of the magnetization vector of free layer.And the boundary conditions of the spin current continuity and chemical-potential-split equality are employed.The critical current in CIMS effect is calculated.The influences of the conductance mismatch of ferromagnetic and nonmagnetic layers and longitudinal applied field on the critical current is interpreted.