Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 13: Multiferroics 2 (jointly with DF, DS, KR, and MA)
TT 13.2: Vortrag
Montag, 11. März 2013, 15:15–15:30, H3
Magnetic field induced charge anisotropy in CoFe2O4/BaTiO3 nanocomposite — •Carolin Schmitz-Antoniak1, Detlef Schmitz2, Sven Stienen1, Pavel Borisov3, Anne Warland1, Bernhard Krumme1, Wolfgang Kleemann1, and Heiko Wende1 — 1Fakultät für Physik, Universität Duisburg-Essen, D-47048 Duisburg — 2Helmholtz-Zentrum Berlin für Materialien und Energie, D-12489 Berlin — 3Department of Chemistry, University of Liverpool, Liverpool L69 7ZD
The system of CoFe2O4 nanopillars in a BaTiO3 matrix represents a multiferroic nanocomposite in which strong ferrimagnetism and strong ferroelectricity coexist at room temperature [1]. The magnetostrictive CFO nanopillars and the piezoelectric BTO matrix are coupled by strain so that it is possible to change the electric properties by a magnetic field and the magnetic properties by an electric field. The charge anisotropy of Ti ions is probed by x-ray linear dichroism (XLD) and the magnetisation of Co ions by x-ray magnetic circular dichroism (XMCD) giving the unique possibility to study the effect of the coupling on a microscopic level as a function of magnetic field strength and direction. The occurrence of significant in-plane components of the electric polarisation is discussed. They are due to shear forces acting on the BaTiO3 matrix while taking into account non-diagonal piezoelectricity components.
Funded by DFG (SFB491) and BMBF (05 ES3XBA/5).
[1] H. Zheng et al., Science 303, 661 (2004)