Anomalous Bias Dependence of Spin Torque in Magnetic Tunnel Junctions

Abstract

We predict an anomalous bias dependence of the spin transfer torque parallel to interface, $T_{||}$, in magnetic tunnel junctions (MTJ), which can be selectively tuned by the exchange splitting. It may exhibit a sign reversal {\it without} a corresponding sign reversal of the bias or even a quadratic bias dependence. We demonstrate that the underlying mechanism is the interplay of spin currents for the ferromagnetic (antiferromagnetic) configurations, which vary linearly (quadratically) with bias, respectively, due to the symmetric (asymmetric) nature of the barrier. The spin transfer torque perpendicular to interface exhibits a quadratic bias dependence.

4 pages, 5 figures

References in corpus (9)

• Current-driven Magnetization Reversal and Spin Wave Excitations in Co/Cu/Co Pillars
• Anatomy of Spin-Transfer Torque
• Currents, Torques, and Polarization Factors in Magnetic Tunnel Junctions
• Non-collinear Magnetoelectronics
• Spin-Transfer Effects in Nanoscale Magnetic Tunnel Junctions
• Spin torque, tunnel-current spin polarization and magnetoresistance in MgO magnetic tunnel junctions
• A selfconsistent theory of current-induced switching of magnetization
• Quantum oscillation of magnetoresistance in tunneling junctions with a nonmagnetic spacer
• Current-driven magnetic rearrangements in spin-polarized point contacts

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