The influence of a spin-polarized current on long ferromagnetic nanostripesis studied numerically. The current flows perpendicularly to the stripe. Thestudy is based on the Landau-Lifshitz phenomenological equation with theSlonczewski-Berger spin-torque term. The magnetization behavior is analyzed forall range of the applied currents, up to the saturation. It is shown that thesaturation current is a nonmonotonic function of the stripe width. For a stripewidth increasing it approaches the saturation value for an infinite film. Anumber of stable periodic magnetization structures are observed below thesaturation. Type of the periodical structure depends on the stripe width.Besides the one-dimensional domain structure, typical for narrow wires, and thetwo-dimensional vortex-antivortex lattice, typical for wide films, a number ofintermediate structures are observed, e.g. cross-tie and diamond state. Fornarrow stripes an analytical analysis is provided.
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