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Dresden 2014 – scientific programme

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KR: Fachgruppe Kristallographie

KR 4: Multiferroics I (MA jointly with DF, DS, KR, TT)

KR 4.12: Talk

Tuesday, April 1, 2014, 12:30–12:45, BEY 118

Multiferroicity in Cu2OSeO3? — •Eugen Ruff1, Stephan Krohns1, Helmuth Berger2, Peter Lunkenheimer1, and Alois Loidl11Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg — 2Institute of Physics of Complex Matter, École Polytechnique Fédérale de Lausanne

Skyrmions are topologically stable vortex-like objects, for the first time detected in the B20 alloy MnSi [1]. Their electrical controllability via small currents qualifies skyrmions for applications in high-density magnetic storage devices. The recent discovery of magnetoelectric skyrmions in the insulating chiral magnet Cu2OSeO3 leads to another promising route to electrical control [2]. This system is suggested to carry a local electrical dipole, which implies that the skyrmions should be controllable by an external electrical field without losses due to Joule heating. Here we provide a thorough analysis of the magnetic and polar phases of this material, using SQUID and pyrocurrent measurements. In order to investigate the possible ferroelectric properties of Cu2OSeO3, we have performed dielectric spectroscopy in various magnetic fields in a broad frequency range below 70 K. Combining all these different techniques, we address the question whether Cu2OSeO3 is magnetoelectric or multiferroic. [1] S.Mühlbauer et al., Science 323, 915 (2009). [2] S.Seki et al., Science 336, 198 (2012).

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