A three-order-parameter bistable magnetoelectric multiferroic metal

Andrea Urru, Francesco Ricci, Alessio Filippetti, Jorge Íñiguez and Vincenzo Fiorentini ()
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Andrea Urru: Università di Cagliari, Cittadella Universitaria, Monserrato
Francesco Ricci: Université Catholique de Louvain, Chemin des Étoiles 8
Alessio Filippetti: Università di Cagliari, Cittadella Universitaria, Monserrato
Jorge Íñiguez: Luxembourg Institute of Science and Technology, 5 avenue des Hauts-Fourneaux
Vincenzo Fiorentini: Università di Cagliari, Cittadella Universitaria, Monserrato

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Using first-principles calculations we predict that the layered-perovskite metal Bi5Mn5O17 is a ferromagnet, ferroelectric, and ferrotoroid which may realize the long sought-after goal of a room-temperature ferromagnetic single-phase multiferroic with large, strongly coupled, primary-order polarization and magnetization. Bi5Mn5O17 has two nearly energy-degenerate ground states with mutually orthogonal vector order parameters (polarization, magnetization, ferrotoroidicity), which can be rotated globally by switching between ground states. Giant cross-coupling magnetoelectric and magnetotoroidic effects, as well as optical non-reciprocity, are thus expected. Importantly, Bi5Mn5O17 should be thermodynamically stable in O-rich growth conditions, and hence experimentally accessible.

Date: 2020
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DOI: 10.1038/s41467-020-18664-6

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