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

Y. H. Tang, Nicholas Kioussis, Alan Kalitsov, Roberto Car

Research output: Contribution to journalArticle

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Abstract

We have generalized the nonequilibrium Green's functions Keldysh formalism to study the effect of interfacial disorder on the average spin transfer torque, T , in magnetic tunnel junctions (MTJs). We find a sinusoidal angular behavior of the average T as in ideal MTJs. We demonstrate for the first time that the general expression of the bias behavior of the average T 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 in the positive bias region, due to the disorder-induced resonance states at interface which selectively assist the transmission of right-coming electrons.

Original languageEnglish (US)
Article number07C920
JournalJournal of Applied Physics
Volume109
Issue number7
DOIs
StatePublished - Apr 1 2011

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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