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Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 47: Multiferroics II (jointly with DF, KR, TT)

MA 47.1: 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. Hemberger11University 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.

Funded through the Institutional Strategy of the

University of Cologne within the German Excellence Initiative.

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

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