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Spin-transfer Torque and Topological Changes of Magnetic Textures

Abstract : The electric manipulation of magnetic textures in nanostructures, important for applications in spintronics, can be realized through the spin-transfer torque mechanism: a spin-polarized current can modify the magnetization of skyrmions and magnetic vortices, and eventually change the topology of the magnetization. The spin-transfer torque and the intrinsic space and time scales of the topological changes are essentially quantum mechanical. We model the interaction between itinerant and fixed spins with a simple tight-binding hamiltonian in a square lattice. The dynamics is described by the Schrödinger equation for the electrons and the Landau-Lifshitz equation for the evolution of the magnetic texture. We investigate the phenomenology of the topological change of a Belavin-Polyakov skyrmion under the action of a spin-polarized current and show that adding an exchange dissipation term, regularizes the transition towards a ferromagnetic state.
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https://hal-amu.archives-ouvertes.fr/hal-01500449
Contributor : Alberto Verga <>
Submitted on : Monday, April 3, 2017 - 11:56:58 AM
Last modification on : Monday, March 19, 2018 - 4:01:14 PM
Long-term archiving on: : Tuesday, July 4, 2017 - 1:03:19 PM

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Alberto Verga. Spin-transfer Torque and Topological Changes of Magnetic Textures. Discontinuity, Nonlinearity, and Complexity, L & H Scientific Publishing, 2016, 5 (1), pp.19--24. ⟨10.5890/DNC.2016.03.003⟩. ⟨hal-01500449⟩

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