Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 40: Poster Session Correlated Electrons

TT 40.62: Poster

Mittwoch, 13. März 2013, 15:00–19:00, Poster D

Skyrmionic exictations in magnetoelectric Cu₂OSeO₃ — •Steffen Harms¹, Maria Belesi², Helmuth Berger³, Jean-Philippe Ansermet³, Christoph Grams¹, Daniel Niermann¹ und Joachim Hemberger¹ — ¹2. Physikalisches Institut, University of Cologne, Germany — ²Leibniz Institute for Solid State and Material Research, Dresden, Germany — ³Institut de Physique de la Matière Condensée, Ecole Polytechnique Fédérale de Lausanne, Switzerland

Skyrmions are topologically protected spin textures that can be characterized by their winding number. Since their discovery in MnSi, skyrmions are of special interest because of their high potential for applications in spintronics [1]. The magnetoelectric helimagnetic insulator Cu₂OSeO₃ undergoes a phase transition from the helical magnetic phase into the skyrmion phase at 57.5 K around 200 Oe. It was recently shown, that the excitation of these phases can be seen in the microwave absorption spectra where an AC magnetic field was coupled to the sample [2]. We present the results of our broadband dielectric spectroscopy measurements up to 4 GHz, in which we measured the excitiations created by coupling an AC electric field to the sample for different magnetic fields at fixed temperatures of 57.5 K and 40 K.

Work supported by the DFG through SFB 608.
[1] C. Pfleiderer and A. Rosch., Nature 465, 880 (2010)

[2] Y. Onose et al., Phys. Rev. Lett. 109, 037603 (2012)