A three-order-parameter bistable magnetoelectric multiferroic metal
(2020) Nature Communications — Vol. 11, n° 1 (2020)
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- Authors
Íñiguez, Jorge 
Fiorentini, Vincenzo
- 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.
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Citations
Urru, A., Ricci, F., Filippetti, A., Íñiguez, J., & Fiorentini, V. (2020). A three-order-parameter bistable magnetoelectric multiferroic metal. Nature Communications, 11(1). https://doi.org/10.1038/s41467-020-18664-6 (Original work published 2020)