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MA: Fachverband Magnetismus
MA 17: Computational Magnetism II
MA 17.12: Vortrag
Dienstag, 19. März 2024, 12:30–12:45, EB 202
Energy-efficient control of magnetic states — Mohammad Badarneh1, Grzegorz Kwiatkowski1, and •Pavel Bessarab1,2 — 1Science Institute, University of Iceland, Reykjavik, Iceland — 2Linnaeus University, Kalmar, Sweden
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 change in the magnetic structure. 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 control 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 [2], spin-wave assisted magnetization reversal in nanowires [3], and optimal skyrmion motion in synthetic antiferromagnets.
[1] G.J. Kwiatkowski et al., Phys. Rev. Lett. 126, 177206 (2021).
[2] S.M. Vlasov et al., Phys. Rev. B 105, 134404 (2022).
[3] M.H.A. Badarneh et al., Nanosyst. Phys. Chem. Math. 11, 294 (2020).
Keywords: magnetization dynamics; optimal control; skyrmion; magnetic nanowires; magnetization reversal