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A macroscopic model of current-induced magnetization switching based on magnetic dynamic equation

Ren Min Zhang Lei Hu Jiu-Ning Deng Ning Chen Pei-Yi

A macroscopic model of current-induced magnetization switching based on magnetic dynamic equation

Ren Min, Zhang Lei, Hu Jiu-Ning, Deng Ning, Chen Pei-Yi
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  • Abstract views:  4451
  • PDF Downloads:  1463
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Publishing process
  • Received Date:  01 August 2006
  • Accepted Date:  20 October 2006
  • Published Online:  20 May 2007

A macroscopic model of current-induced magnetization switching based on magnetic dynamic equation

  • 1. 清华大学微电子学研究所,北京 100084

Abstract: A macroscopic phenomenological model based on the magnetic dynamic equation was proposed to investigate spin-polarized current induced magnetization switching in a nano-scale pseudo-spin-valve structure. The movement and even reversal of the free layer's magnetization resulted from two factors, the net spin flux flowing into the free layer and the spin relaxation within it. The dynamic equation incorporated the spin-dependent scattering at the ferromagnetics/nonmagnetics interfaces, and the relaxation of spin accumulation in the ferromagnetic layer. Conditions of magnetization reversal and the corresponding critical currents were found by solving the dynamic equation analytically. The qualitative and quantitative results agree with most of experiments reported. According to the model, the influencing factors on the critical current were analyzed and the methods to improve device performances were pointed out.

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