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29 March 2024
 
  » arxiv » 1306.6296

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Periodic magnetic structures generated by spin-polarized currents in nanostripes
Oleksii M. Volkov ; Volodymyr P. Kravchuk ; Denis D. Sheka ; Franz G. Mertens ; Yuri Gaididei ;
Date 26 Jun 2013
AbstractThe influence of a spin-polarized current on long ferromagnetic nanostripes is studied numerically. The current flows perpendicularly to the stripe. The study is based on the Landau-Lifshitz phenomenological equation with the Slonczewski-Berger spin-torque term. The magnetization behavior is analyzed for all range of the applied currents, up to the saturation. It is shown that the saturation current is a nonmonotonic function of the stripe width. For a stripe width increasing it approaches the saturation value for an infinite film. A number of stable periodic magnetization structures are observed below the saturation. Type of the periodical structure depends on the stripe width. Besides the one-dimensional domain structure, typical for narrow wires, and the two-dimensional vortex-antivortex lattice, typical for wide films, a number of intermediate structures are observed, e.g. cross-tie and diamond state. For narrow stripes an analytical analysis is provided.
Source arXiv, 1306.6296
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