Effect of disorder on spin-transfer torque in magnetic tunnel junctions

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題名:	Effect of disorder on spin-transfer torque in magnetic tunnel junctions
作者:	Tang,YH;Kioussis,N;Kalitsov,A;Car,R
貢獻者:	物理學系
關鍵詞:	BARRIER
日期:	2011
上傳時間:	2012-06-11 10:48:37 (UTC+8)
出版者:	國立中央大學
摘要:	We have generalized the nonequilibrium Green's functions Keldysh formalism to study the effect of interfacial disorder on the average spin transfer torque, < T(parallel to)>, in magnetic tunnel junctions (MTJs). We find a sinusoidal angular behavior of the average < T(parallel to)> as in ideal MTJs. We demonstrate for the first time that the general expression of the bias behavior of the average < T(parallel to)> in terms of the interplay of average spin current densities in collinear configurations is valid even in the presence of disorder. This explains the strong enhancement and sign reversal of < T(parallel to)> in the positive bias region, due to the disorder-induced resonance states at interface which selectively assist the transmission of right-coming electrons. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3565396]
關聯:	JOURNAL OF APPLIED PHYSICS
顯示於類別:	[物理學系] 期刊論文

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