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MA: Fachverband Magnetismus

MA 18: Posters Magnetism V

MA 18.27: Poster

Freitag, 1. Oktober 2021, 10:00–13:00, P

Energy-efficient control of magnetic states — Mohammad Badarneh¹, Grzegorz Kwiatkowski¹, Sergei Vlasov², Igor Lobanov², Valery Uzdin², and •Pavel Bessarab^1,2 — ¹University of Iceland, Reykjavik — ²ITMO University, St. Petersburg, Russia

Control of magnetization switching is critical for the development of novel technologies based on magnetic materials. Transitions between magnetic states can follow various pathways which are not equivalent in terms of energy consumption and duration. In this study, we propose a general theoretical approach based on the optimal control theory to design external stimuli for efficient switching between target magnetic states. The approach involves calculation of optimal control paths (OCPs) for the desired magnetic transition. Following an OCP involves rotation of magnetic moments in such a way that the strength of the external stimulus is minimized, but the system’s internal dynamics is effectively used to aid the switching. All properties of the switching pulses including temporal and spatial shape can be derived from OCPs in a systematic way. Various applications of OCP calculations are presented, including energy-efficient switching of a nanomagnet by means of external magnetic field [1] or electric current, and spin-wave assisted magnetization reversal in nanowires [2].

This work was funded by the Russian Science Foundation (Grant No. 19-72-10138), the Icelandic Reseach Fund (Grant No. 184949-052).

[1] G.J. Kwiatkowski et al., Phys. Rev. Lett. 126, 177206 (2021).

[2] M.H.A. Badarneh et al., Nanosyst. Phys. Chem. Math. 11, 294 (2020).