Current driven spin-wave instability triggered by the anomalous Hall effect

Details Current driven spin-wave instability triggered by the anomalous Hall effect Current driven spin-wave instability triggered by the anomalous Hall effect

2008-02-28

arxiv.org/abs/0802.4150v1

Physics

Condensed Matter

Materials Science

4 pages, 1 figure

Scientific paper

10.1103/PhysRevB.77.100404

We studied the effect of strong electric current on spin waves interacting relativistically with the current. The spin-wave spectrum is calculated at arbitrary direction of the wave vector. It is shown that the alternating Hall current generated by the alternating magnetic moment of the spin waves, reduces the spin-wave damping. At strong enough unpolarized dc current the damping changes sign, and the spin-wave amplitude starts to increase exponentially fast with time. The critical current for the spin-wave instability is determined mainly by the anomalous Hall effect, and can be much smaller than that for the spin-torque mechanism of instability.

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