Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 9: Joint Session "Multiferroics II - Hexagonal Manganites / Incommensurate Multiferroics" (jointly with DF, DS, KR, TT)

MA 9.4: Vortrag

Montag, 26. März 2012, 16:00–16:15, EB 301

Direct observation of multiferroicity in TbMnO₃ thinfilms — •Artur Glavic¹, Jörg Voigt¹, Enrico Schierle², Eugen Weschke², and Thomas Brückel¹ — ¹Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszeutrum Jülich GmbH, Jülich, Germany — ²Helmholtz-Zentrum Berlin für Materialien und Energie, BESSY II, Albert-Einsteinstr. 15, Berlin, Germany

Multiferroic rare earth manganites as TbMnO₃ have been studied a lot in the past ten years because of their complex magnetic structure, which leads to a ferroelectric polarization. So far investigations on TbMnO₃ thin films grown on LaAlO₃ or SrTiO₃ showed an emergent ferromagnetism, destroying the multiferroic properties.

We have investigated TbMnO₃ films grown with sputter deposition on YAlO₃ substrates using soft x-ray resonant magnetic scattering with linear and circular polarized light. By measuring the circular dichroism originating from the chirality of the magnetic structure we could directly observe multiferroic domains in the thin films. Although the transition temperatures found were comparable to bulk, an additional influence of the Tb magnetic order on the ferroelectricity was observed.