Abstract
The current induced magnetic dynamics of a nano-scale pseudo-spin-valve (PSV) structure was theoretically studied. The spin relaxation mechanisms and the influence of ferromagnetic/nonmagnetic (FM/NM) interfaces on the current polarization were investigated, and a modified magnetic dynamic equation was developed. Both the free layer’s local magnetic moments and itinerant electrons’ spins were regarded as a macro-spin, whose movement was resulted from two items: spin relaxation due to the magnetic dam** and spin accumulation due to the polarized current. The injected current not only produces a spin transfer torque, but also alters the effective magnetic field, and thus affects the dam**. Therefore, the dam** is nonlinear and correlated to the current. Based on the analysis of the competition between magnetic dam** and spin accumulation, the dynamic behaviors of magnetization switching and oscillation can be explained.
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Ren, M., Zhang, L., Hu, J. et al. Nonlinear Dam** Generated by Spin Injection in a Pseudo-spin-valve Structure. MRS Online Proceedings Library 998, 204 (2007). https://doi.org/10.1557/PROC-998-J02-04
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DOI: https://doi.org/10.1557/PROC-998-J02-04