Phys. Rev. B 73, 024425 (2006) [13 pages]Current-induced transverse spin-wave instability in thin ferromagnets: Beyond linear stability analysisReceived 30 August 2005; revised 21 November 2005; published 27 January 2006 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. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.73.024425
DOI:
10.1103/PhysRevB.73.024425
PACS:
75.75.+a, 75.40.Gb, 85.75.−d
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