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

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4 Author(s)
Tang, Y.-H. ; Department of Physics, California State University, Northridge, California 91330-8268, USA ; Kioussis, Nicholas ; Kalitsov, Alan ; Car, Roberto

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We have generalized the nonequilibrium Green’s functions Keldysh formalism to study the effect of interfacial disorder on the average spin transfer torque, ||>, in magnetic tunnel junctions (MTJs). We find a sinusoidal angular behavior of the average ||> as in ideal MTJs. We demonstrate for the first time that the general expression of the bias behavior of the average ||> 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 ||> in the positive bias region, due to the disorder-induced resonance states at interface which selectively assist the transmission of right-coming electrons.

Published in:

Journal of Applied Physics  (Volume:109 ,  Issue: 7 )