SKM 2021 – scientific programme

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MA: Fachverband Magnetismus

MA 18: Posters Magnetism V

MA 18.26: Poster

Friday, October 1, 2021, 10:00–13:00, P

Quantum effects in thermally activated domain wall switching in ferromagnets — •Grzegorz J. Kwiatkowski¹ and Pavel F. Bessarab^1,2 — ¹Science Institute of the University of Iceland, Reykjavík, Iceland — ²ITMO University, St. Petersburg, Russia

Most widely used data storage technologies are based on nanoscale magnetic structures [1]. In order to improve both memory retention and energy efficient writability one needs to increase stability of magnetic samples without a change in energy barrier which directly affects the costs or rewritning the memory. Due to this fact it is vital to optimise the preexponential factor in Arrhenius law, which requires one to properly study the effect of internal degrees of freedom on thermal switching pocesses [2,3]. We present analytic estimation of rate of escape for domain wall switching in 3D samples with focus on how results scale with internal parameters and sample size. Since for spin waves minimum excitation energy is larger then average thermal fluctuation for high frequency modes we employ Bose-Einstein statistics, which leads to nontrivial temperature dependencies of the preexponential factor opening up new possibilities for enhancing stability of magnetic structures. This work was funded by the Russian Science Foundation (Grant No. 19-72-10138) and the Icelandic Reseach Fund (Grant No. 184949-052).

[1] W. A. Challener et al. Nature Photonics volume 3, pages 220-224 (2009) [2] P. F. Bessarab, V. M. Uzdin and H. Jónsson Physical Review Letters 110.2, 020604 (2013) [3] G. Fiedler et al. Journal of Applied Physics 111, 093917 (2012)