Regensburg 2010 – scientific programme
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MA: Fachverband Magnetismus
MA 10: Poster I
MA 10.24: Poster
Tuesday, March 23, 2010, 10:45–13:45, Poster A
Response of antiferromagnetic and ferrotoroidic domains in LiCoPO4 to magnetic and electric fields — •Anne S. Zimmemann1, Bas B. Van Aken1, Jean-Pierre Rivera2, Hans Schmid2, and Manfred Fiebig1 — 1HISKP, University of Bonn, Germany — 2Department of Inorganic, Analytical and Applied Chemistry, University of Geneva, Switzerland
Ferrotoroidicity denotes a fourth form of ferroic order with a spontaneous uniform alignment of magnetic vortices. Recently the observation of antiferromagnetic (AFM) domains coexisting with ferrotoroidic (FTO) domains in LiCoPO4 was reported in second harmonic generation (SHG) experiments [1]. Controlled manipulation of these FTO domains would be the next step in demonstrating the ferroic nature of the toroidal state. This could be achieved by a toroidal field, e. g. crossed electric and magnetic fields.
Here we report on the behaviour of AFM and FTO domains in external magnetic, electric, and toroidal fields. The domain structure in zero-field cooling and field-cooling experiments was investigated by SHG. Experiments showed that a magnetic field of around 5 T along the x axis changes and pins the domains. Furthermore indications for an additional phase transition were observed. Toroidal poling is thus not possible. Therefore a setup for smaller magnetic and higher electric fields was developed. - Work supported by the SFB 608.
[1] B. B. Van Aken et. al., Nature 449, 702 (2007)
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