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TT: Fachverband Tiefe Temperaturen

TT 37: Skyrmions II (joint session MA/TT)

TT 37.6: Vortrag

Mittwoch, 18. März 2020, 11:00–11:15, POT 6

Evolution of topological charge during transitions between magnetic states — •Igor Lobanov — ITMO University, Saint Petersburg, Russia — Saint Petersburg State University, Russia

Stability of magnetic skyrmions and other topological structures is an important prerequisite for the development of magnetic storage and computing devices. Evaluation of lifetime of magnetic states and the most probable transition scenario can be performed using harmonic transition state theory [1,2] and minimum energy path (MEP) calculation. Results on annihilation of skyrmionium to the ferromagnetic state are presented. There, the initial state and the final state are both of zero topological charge, but the charge is not necessarily conserved during the transition between the states. Several MEPs for the skyrmionium annihilation are identified, corresponding activation energies and transition rates are systematically compared, while variation of the topological charge along each MEP is analyzed. The dependence of lifetime on the lattice constant is studied, the resulting switching of the preferable path is demonstrated. The calculated MEPs give us a hint for optimal control of nucleation and annihilation of topologically protected structures.

This work was funded by the Russian Science Foundation (Grant No. 19-72-10138).

1. G. Fiedler, J. Fidler, J. Lee, T. Schrefl, R. L. Stamps, H. B. Braun, and D. Suess, J. Appl. Phys. 111, 093917 (2012)

2. P.F. Bessarab, V.M. Uzdin, H. Jonsson, Phys. Rev. B 85, 184409 (2012)