Work

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

Year: 2011

Type: article

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.

Source: Journal of Applied Physics

DOI: 10.1063/1.3565396

Authors: Y.-H. Tang, Nicholas Kioussis, Alan Kalitsov, Roberto Car

Institutions: California State University, Northridge, National Central University, Princeton University

Language: English

Topic: Magnetic properties of thin films

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green