Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 57: Focus Session: Spinorbitronics – from efficient charge/spin conversion based on spin-orbit coupling to chiral magnetic skyrmions III (joint session MA/TT)

MA 57.6: Hauptvortrag

Freitag, 16. März 2018, 11:30–12:00, H 1012

Magnonics in skyrmion-hosting chiral magnetic materials — •Markus Garst — Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany

Chiral magnets with a Dzyaloshinskii-Moriya interaction possess spatially modulated phases of the ferromagnetic order parameter like helices and skyrmion lattices. We give an overview of the properties of spinwave excitations in such materials [1]. In the presence of a magnetic field, the magnons are characterized by an inherent non-reciprocity, i.e., their dispersion lack reflection symmetry. We discuss the evolution of non-reciprocity as a function of magnetic field, which has been determined by inelastic neutron scattering on MnSi [2,3]. Moreover, Bragg reflection off the periodicity of the magnetic textures naturally result in magnon band structures. This band structure is topologically non-trivial for the skyrmion lattice due its emergent electrodynamics, which is reflected in non-trivial Chern numbers implying the presence of robust magnon edge states [1]. In addition, we discuss the ferromagnetic resonances of the various phases [4] and their non-reciprocity, which has been experimentally probed by spin-wave spectroscopy and Brillouin light scattering.

[1] M. Garst, J. Waizner, and D. Grundler, J. Phys. D: Appl. Phys. 50, 293002 (2017) [2] M. Kugler, et al. Phys. Rev. Lett. 115, 097203 (2015) [3] T. Weber et al. arXiv:1708.02098 [4] T. Schwarze et al. Nat. Mat. 14, 478 (2015)