Magnetic soliton dynamics driven by spin-transfer torque in perpendicular magnetic anisotropy devices

Finocchio, G and Puliafito, V and Komineas, S and Torres, L and Ozatay, O and Hauet, T and Azzerboni, B (2013) Magnetic soliton dynamics driven by spin-transfer torque in perpendicular magnetic anisotropy devices. Journal of Applied Physics, AIP, 114. p. 163908. ISSN 00218979

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Abstract

This paper demonstrates how to excite a complex soliton mode in nanomagnets with perpendicular to plane magnetic anisotropy by means of the non-uniform injection of a spin-polarized current via a nano-aperture. We present two different numerical frameworks. In the first one, the polarizer has perpendicular anisotropy, the excited mode exhibits oscillation frequency in the GHz range with a spatial distribution localized near the nano-aperture. The study of the topological density indicates that the persistent magnetization dynamics is characterized by a rotation of two bubble/antibubble pairs. The second scenario corresponds to the experimental framework by [S. M. Mohseni, et al, Science, 339, 1295, (2013).], where the polarizer has an in-plane anisotropy polarizer whose magnetization is tilted under the action of a large external field. Our study identifies the topological density of the dissipative droplet formed in that geometry as a bubble/antibubble pair. The methodological study introduced here for the spintronic oscillators and based on the time domain evolution of the topological density should be very useful in the fundamental understanding of the soliton dynamics.

Item Type: Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Engineering, Science and Mathematics > School of Mathematics > Department of Applied Mathematics
Depositing User: Mr Stavros Komineas
Date Deposited: 20 Jan 2014 11:39
Last Modified: 23 Nov 2017 03:09
URI: http://preprints.acmac.uoc.gr/id/eprint/265

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