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Berlin 2012 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

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

DF 4.9: Vortrag

Montag, 26. März 2012, 17:30–17:45, EB 301

A further step of understanding the complex magnetic order in magnetoelectric Co3TeO6 — •Vera Carolus1, Thomas Lottermoser2, Matthias Hudl3, Pierre Tolédano4, and Manfred Fiebig21HISKP, University of Bonn, Germany — 2Department of materials, ETH Zurich, Switzerland — 3Department of Engineering Sciences, Uppsala University, Box 534, SE-751 21 Uppsala, Sweden — 4Laboratory of Physics of Complex Systems, University of Picardie, 33 rue Saint-Leu, 80000 Amiens, France

Like most of the known magnetoelectric multiferroics, Co3TeO6 exhibits a complex spin structure with a series of consecutive phase transitions. Contrary to common compounds, Co3TeO6 possesses two independent commensurate k-vectors in the multiferroic low-temperature phase. In addition, magnetic-field dependent measurements of the ferroelectric polarization show a strongly anisotropic behaviour.

Here we show our results using spatially resolved optical second harmonic generation (SHG) under external magnetic and electric fields in the multiferroic low-temperature phase. However, the SHG gives only access to the magnetic subsystem. Like the ferroelectric polarization, the magnetic structure shows strongly anisotropic behaviour. In crossed magnetic and electric fields we were able to reach a single-domain state, while a magnetic field solely always leads to distinctively different multi-domain states. Most remarkably, for a certain direction of magnetic field, we were able to invert the multi-domain state. Furthermore, this behaviour indicates the existence of a pronounced memory effect.

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