Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 77: Multiferroics
(Joint session of MA, DF, DS, KR and TT organized by MA)

TT 77.1: Vortrag

Donnerstag, 10. März 2016, 15:00–15:15, H34

Skyrmionic and ferromagnetic resonances in magnetoelectric Cu₂OSeO₃ - magnetic vs electric fields — •S. Harms¹, M. Belesi², H. Berger³, J.-F. Ansermet³, C. Grams¹, P. Becker¹, and J. Hemberger¹ — ¹University of Cologne, Germany — ²IFW, Dresden, Germany — ³ICMP, EPFL, Lausanne, Switzerland

Magnetic Skyrmions are topologically stable spin whirls stabilized by spin-orbit interaction in chiral cubic magnets. It has been shown, that skyrmionic structures can be efficiently manipulated by small forces, such as e.g. currents in metallic host materials [1]. It was also shown, that the skyrmion phases in general can be excited by AC magnetic fields in the microwave range. [2].
The magnetoelectric helimagnetic insulator Cu₂OSeO₃ is one of the up to now rare cases of an insulating chiral magnets showing a stable skyrmion lattice embedded in between helical and ferrimagnetic phases. In this compound the lack of magnetic inversion symmetry leads to the occurrence of electric polarization and correspondingly to a magnetoelectric response. We present results of broadband spectroscopy up to 5 GHz trying to disentangle the different influence of electric and magnetic fields.

[1] T. Schulz et al., Nature Physics 8, 301-304 (2012).
Y. Onose et al., Phys. Rev. Lett. 109, 037603 (2012).