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TT: Fachverband Tiefe Temperaturen

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

TT 37.10: Vortrag

Mittwoch, 18. März 2020, 12:15–12:30, POT 6

Spin waves in skyrmions with various topological charges — •Levente Rózsa and Ulrich Nowak — Universität Konstanz, Konstanz, Deutschland

Magnetic skyrmions offer promising prospects for the development of magnonic devices. The most widely studied mechanism to date for the stabilization of skyrmions is the Dzyaloshinsky-Moriya interaction (DMI). Although a wide variety of localized spin wave modes has been predicted theoretically in DMI-stabilized skyrmions [1], their experimental observation via excitation by a homogeneous external field has been restricted to breathing and gyrational modes. This can be attributed to the angular momentum selection rules enforced by the cylindrically symmetric spin structure. In contrast to the DMI, frustrated Heisenberg exchange interactions (FHEI) may stabilize different types of skyrmions with various topological charges [2]. Here we theoretically investigate how the types of localized magnons and the selection rules are modified in FHEI-stabilized skyrmions. The competition between FHEI and DMI is also considered, which was demonstrated to distort the shape of the different types of skyrmions [3].

[1] M. Garst et al., J. Phys. D: Appl. Phys. 50, 293002 (2017).

[2] A. O. Leonov et al., Nat. Commun. 6, 8275 (2015).

[3] L. Rózsa et al., Phys. Rev. B 95, 094423 (2017).