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TT: Fachverband Tiefe Temperaturen

TT 69: Correlated Electrons: Spin Systems and Itinerant Magnets - Chiral Magnets

TT 69.5: Vortrag

Mittwoch, 2. April 2014, 16:00–16:15, HSZ 204

Excitations in magnetoelectric Cu₂OSeO₃ — •Steffen Harms¹, Maria Belesi², Helmuth Berger³, Jean-Philippe Ansermet³, Daniel Niermann¹, Christoph Grams¹, and 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

The magnetoelectric helimagnetic insulator Cu₂OSeO₃ shows a multiplicity of magnetic phases due to the interplay of ferrimagnetic and Dzyaloshinkii-Moriya interaction. It was recently shown, that the excitations of these phases can be seen in the microwave absorption spectra where an AC magnetic field was coupled to the sample[1].
Additionally, topologically protected spin textures called skyrmions have been identified in these spectra. Since their discovery in MnSi, skyrmions have been of specialy interest because of their high potential for applications in spintronics[2].
We present the results of our broadband dielectric spectroscopy measurements up to 5 GHz, in which we measured the excitations created by coupling electric and magnetic AC-fields to the sample for different magnetic DC-fields at fixed temperatures of 57.5 K and 40 K.

Funded through the Institutional Strategy of the University of Cologne within the German Excellence Initiative.
Y. Onose et al., Phys. Rev. Lett. 109, 037603 (2012)
C. Pfleiderer and A. Rosch., Nature 465, 880 (2010)