Current induced transverse spin-wave instability in thin ferromagnets: beyond linear stability analysis

Details Current induced transverse spin-wave instability in thin ferromagnets: beyond linear stability analysis Current induced transverse spin-wave instability in thin ferromagnets: beyond linear stability analysis

2005-08-30

arxiv.org/abs/cond-mat/0508732v1

Phys. Rev. B 73, 024425 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

14 pages, 10 figures; revtex4

Scientific paper

10.1103/PhysRevB.73.024425

A sufficiently large unpolarized current can cause a spin-wave instability in thin nanomagnets with asymmetric contacts. The dynamics beyond the instability is understood in the perturbative regime of small spin-wave amplitudes, as well as by numerically solving a discretized model. In the absence of an applied magnetic field, our numerical simulations reveal a hierarchy of instabilities, leading to chaotic magnetization dynamics for the largest current densities we consider.

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