Stochastic formation of magnetic vortex structures in asymmetric disks triggered by chaotic dynamics

Mi-Young Im (), Ki-Suk Lee (), Andreas Vogel, Jung-Il Hong, Guido Meier and Peter Fischer
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Mi-Young Im: Center for X-ray Optics, Lawrence Berkeley National Laboratory
Ki-Suk Lee: School of Materials Science and Engineering, KIST-UNIST Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology
Andreas Vogel: Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg
Jung-Il Hong: Daegu Gyeongbuk Institute of Science and Technology
Guido Meier: Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg
Peter Fischer: Center for X-ray Optics, Lawrence Berkeley National Laboratory

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract The non-trivial spin configuration in a magnetic vortex is a prototype for fundamental studies of nanoscale spin behaviour with potential applications in magnetic information technologies. Arrays of magnetic vortices interfacing with perpendicular thin films have recently been proposed as enabler for skyrmionic structures at room temperature, which has opened exciting perspectives on practical applications of skyrmions. An important milestone for achieving not only such skyrmion materials but also general applications of magnetic vortices is a reliable control of vortex structures. However, controlling magnetic processes is hampered by stochastic behaviour, which is associated with thermal fluctuations in general. Here we show that the dynamics in the initial stages of vortex formation on an ultrafast timescale plays a dominating role for the stochastic behaviour observed at steady state. Our results show that the intrinsic stochastic nature of vortex creation can be controlled by adjusting the interdisk distance in asymmetric disk arrays.

Date: 2014
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DOI: 10.1038/ncomms6620

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