Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: Multiferroics
MA 20.1: Vortrag
Mittwoch, 27. Februar 2008, 14:00–14:15, EB 202
Observation of ferrotoroidic order in LiCoPO4 — •Manfred Fiebig1,2, Bas B. Van Aken1,2, Jean-Pierre Rivera3, and Hans Schmid3 — 1HISKP, Universität Bonn, Nussallee 14–16, 53115 Bonn, Germany — 2Max-Born-Institut, Max-Born-Straße 2A, 12489 Berlin, Germany — 3Department of Chemistry, University of Geneva, 30 quai Ernest-Ansermet, 1211 Geneva 4, Switzerland
Domains are an essential property of any ferroic material. Three forms of ferroic order (ferromagnetism, ferroelectricity, ferroelasticity) are widely known. It is currently debated whether to include an ordered arrangement of magnetic vortices as fourth form of ferroic order termed ferrotoroidicity [1]. Although there are reasons to do this from the point of view of thermodynamics a crucial hallmark of the ferroic state, i.e., ferrotoroidic domains, has never been observed. Here ferrotoroidic domains are spatially resolved by optical second harmonic generation in LiCoPO4 where they coexist with independent antiferromagnetic domains [2]. The origin of ferrotoroidicity in LiCoPO4 is discussed. Their space- and time asymmetric nature relates ferrotoroidics to multiferroics with magnetoelectric phase control and other systems in which space and time asymmetry leads to exciting possibilities for future application. — Work supported by the SFB 608 of the DFG.
[1] C. Ederer, N.A. Spaldin, arXiv:0706.1974v1 [cond-mat.str-el], Phys. Rev. B, in press (2007)
[2] B.B. Van Aken, J.P. Rivera, H. Schmid, M. Fiebig, Nature 449, 702 (2007)