Domain instability during magnetization precession.
Spin wave equations describing the nonequilibrium precessional state of a ferromagnetic system are given. The equations reveal a new type of spin wave instability (SWI) towards growing domains of uniform magnetization. In the developed stages of SWI a nonstationary picture of domain chaos is revealed by numerical simulations. SWI is capable of explaining recent experimental observation of stochastic switching in precessional magnetization reversal.
L.D. Landau Institute for Theoretical Physics, Russian Academy of Sciences, 2 Kosygina Street, 119334 Moscow, Russia.
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Kashuba