Spin torque from tunneling through impurities in a magnetic tunnel junction

Details Spin torque from tunneling through impurities in a magnetic tunnel junction Spin torque from tunneling through impurities in a magnetic tunnel junction

2009-02-06

arxiv.org/abs/0902.1150v2

Phys. Rev. B 80, 014434 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 figures

Scientific paper

10.1103/PhysRevB.80.014434

We calculate the contribution to the spin transfer torque from sequential tunneling through impurities in a magnetic tunnel junction. For a junction with weakly polarized ferromagnetic contacts, the torque is found to be in the plane spanned by the magnetizations of the ferromagnetic contacts and proportional to $\sin \theta$, where $\theta$ is the angle between the magnetic moments. If the polarization is larger, the torque acquires a significant out-of-plane component and a different dependence on $\theta$.

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