A three-order-parameter bistable magnetoelectric multiferroic metal

Auteurs

U. Urru, F. Ricci, A. Filippetti, J. Íñiguez, and V. Fiorentini

Référence

Nature Communications, vol. 11, no. 1, art. no. 4922, 2020

Description

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.

Lien

doi:10.1038/s41467-020-18664-6

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