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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 3: Multiferroics and Magnetoelectric Coupling (joint session MA/KFM)
KFM 3.1: Vortrag
Montag, 17. März 2025, 09:30–09:45, H16
Trilinear coupling and toroidicity in multiferroics — Andrea Urru1 and •Vincenzo Fiorentini2,3 — 1Dept. of Physics, Rutgers University, USA — 2Chair of Materials Science and Nanotech, TU Dresden — 3Dept. Physics, University of Cagliary, Italy
We discuss the properties of the triple-order-parameter (ferromagnet, ferroelectric, ferrotoroid) layered-perovskite metal Bi5Mn5O17, as predicted from first-principles calculations, in the light of a Landau expansion with trilinear coupling, with particular reference to its multiple degenerate ground states with mutually orthogonal vector order parameters, giant cross-coupling magnetoelectricity, and magnetotoroidic effects.
Keywords: Multiferroic; Metal; Ab initio calculations