Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 54: Magnetic textures: Transport and dynamics III

MA 54.11: Vortrag

Freitag, 5. April 2019, 12:15–12:30, H37

Damping of spin wave modes in magnetic skyrmions — •Levente Rózsa, Julian Hagemeister, Elena Y. Vedmedenko, and Roland Wiesendanger — University of Hamburg, Hamburg, Germany

Magnetic skyrmions are localized noncollinear spin configurations, which have attracted significant research attention lately in the field of magnonics due to their spin wave excitation modes connected to the magnetic structure [1]. Understanding the damping mechanisms determining the lifetimes of the magnons is required for future technological applications.

Here the connection between noncollinear spin configurations and the effective damping parameters of spin waves is investigated, which are shown to be mode-dependent and enhanced compared to the Gilbert damping α [2]. It is demonstrated how these effective damping parameters can be calculated based on the elliptic polarization of the modes in the limit of vanishing α, and how excitations may become overdamped for larger α values. The results are illustrated for the example of isolated kπ skyrmions, cylindrically symmetric spin configurations where the out-of-plane spin component rotates by kπ between the center and the collinear background. The role of effective damping parameters is discussed close to the instabilities of the skyrmions at low and high field values [3].

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

[2] L. Rózsa et al., Phys. Rev. B 98, 100404(R) (2018).

[3] L. Rózsa et al., arXiv:1810.06471 (2018).