Anomalous Bias Dependence of Spin Torque in Magnetic Tunnel Junctions

Details Anomalous Bias Dependence of Spin Torque in Magnetic Tunnel Junctions Anomalous Bias Dependence of Spin Torque in Magnetic Tunnel Junctions

2006-06-05

arxiv.org/abs/cond-mat/0606080v3

Phys. Rev. Lett. 97, 237205 (2006)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.97.237205

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.

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