Victor Baledent
University of Paris Sud, France
Title: New insight in the physics of RMn2O5 multiferroics
Biography
Biography: Victor Baledent
Abstract
RMn2O5 materials have long been presented as spin induced multiferroic family, where the electric polarization develops concomitantly with a magnetic transition at low temperature. The complex magnetic order originates from the frustration of anti-ferromagnetic loops of 5 sites in the (a,b) plane as illustrated in the Figure. What makes them particularly interesting lies in their singular properties: an electric polarization among the strongest reported so far (3600µC.cm-2 in GdMn2O5), a strong magneto-electric coupling (enabling a polarization flip under a magnetic field of 2T in TbMn2O5), and a magnetism that indicates a different fundamental mechanism than the standard Dzyaloshinskii-Moriya Interaction. In this presentation, I will present our recent results on both atomic and magnetic structures of several members of this family, shedding a new light on the physic and problematic of RMn2O5.