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MA: Fachverband Magnetismus
MA 42: Posters Magnetism I
MA 42.56: Poster
Mittwoch, 18. März 2020, 15:00–18:00, P3
Optimal control of magnetic states — Mohammad Badarneh1, Grzegorz Kwiatkowski1, and •Pavel Bessarab1,2,3 — 1University of Iceland, Reykjavík, Iceland — 2ITMO University, St. Petersburg, Russia — 3Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich, Jülich, Germany
Control of magnetization switching is of critical importance for the development of novel technologies based on magnetic materials. Transitions between stable magnetic states can follow various pathways which are not equivalent in terms of energy consumption and required time. In this study, we propose a general theoretical approach based on the optimal control theory to design pulses of external magnetic field 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 dynamical modes are effectively used to aid magnetization switching. All properties of the switching pulses including temporal and spatial shape can be derived from OCPs in a systematic fashion. Various applications of OCP calculations are presented, including spin-wave assisted magnetization switching in nanowires and nucleation of magnetic skyrmions.
This work was funded by the Russian Science Foundation (Grant No. 19-72-10138), the Icelandic Reseach Fund (Grant No. 184949-052) and Alexander von Humboldt Foundation.