Geometry effects on magnetization dynamics in circular cross-section wires

Abstract : Three-dimensional magnetic memory design based on circular-cross section nanowires with modulated diameter is the emerging field of spintronics. The consequences of the mutual interaction between electron spins and local magnetic moments in such non-trivial geometries are still open to debate. This paper describes the theoretical study of domain wall dynamics within such wires subjected to spin polarized current. We used our home-made finite element software to characterize the variety of domain wall dynamical regimes observed for different constriction to wire diameter ratios d/D. Also, we studied how sizeable geometry irregularities modify the internal micromagnetic configuration and the electron spin spatial distribution in the system, the geometrical reasons underlying the additional contribution to the system's nonadiabaticity, and the specific domain wall width oscillations inherent to fully three-dimensional systems.
Keywords : Nanowires
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Journal articles
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https://hal-cea.archives-ouvertes.fr/cea-01745409
Contributor : Jérôme Planès <>
Submitted on : Wednesday, March 28, 2018 - 10:57:34 AM
Last modification on : Tuesday, May 14, 2019 - 10:19:42 AM

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Magali Sturma, Jean-Christophe Toussaint, Daria Gusakova. Geometry effects on magnetization dynamics in circular cross-section wires. Journal of Applied Physics, American Institute of Physics, 2015, 117 (24), pp.243901. ⟨10.1063/1.4922868⟩. ⟨cea-01745409⟩

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