Multiferroics, showing the coexistence of two or more ferroic orderings at room temperature, could harness a revolution in multifunctional devices. However, most of the multiferroic compounds known to date are not magnetically and electrically ordered at ambient conditions, so the discovery of new materials is pivotal to allow the development of the field. In this work, we show that BaFe2O4 is a previously unrecognized room temperature multiferroic. X-ray and neutron diffraction allowed to reveal the polar crystal structure of the compound as well as its antiferromagnetic behavior, confirmed by bulk magnetometry characterizations. Piezo force microscopy and electrical measurements show the polarization to be switchable by the application of an external field, while symmetry analysis and calculations based on density functional theory reveal the improper nature of the ferroelectric component. Considering the present findings, we propose BaFe2O4 as a Bi- and Pb-free model for the search of new advanced multiferroic materials.

γ-BaFe2O4: a fresh playground for room temperature multiferroicity / Orlandi, Fabio; Delmonte, Davide; Calestani, Gianluca; Cavalli, Enrico; Gilioli, Edmondo; Shvartsman, Vladimir V.; Graziosi, Patrizio; Rampino, Stefano; Spaggiari, Giulia; Liu, Chao; Ren, Wei; Picozzi, Silvia; Solzi, Massimo; Casappa, Michele; Mezzadri, Francesco. - In: NATURE COMMUNICATIONS. - ISSN 2041-1723. - 13:(2022), p. 7968.

γ-BaFe2O4: a fresh playground for room temperature multiferroicity

Fabio Orlandi;Davide Delmonte;Gianluca Calestani;Enrico Cavalli;Patrizio Graziosi;Stefano Rampino;Giulia Spaggiari;Massimo Solzi;Michele Casappa;Francesco Mezzadri
2022-01-01

Abstract

Multiferroics, showing the coexistence of two or more ferroic orderings at room temperature, could harness a revolution in multifunctional devices. However, most of the multiferroic compounds known to date are not magnetically and electrically ordered at ambient conditions, so the discovery of new materials is pivotal to allow the development of the field. In this work, we show that BaFe2O4 is a previously unrecognized room temperature multiferroic. X-ray and neutron diffraction allowed to reveal the polar crystal structure of the compound as well as its antiferromagnetic behavior, confirmed by bulk magnetometry characterizations. Piezo force microscopy and electrical measurements show the polarization to be switchable by the application of an external field, while symmetry analysis and calculations based on density functional theory reveal the improper nature of the ferroelectric component. Considering the present findings, we propose BaFe2O4 as a Bi- and Pb-free model for the search of new advanced multiferroic materials.
2022
γ-BaFe2O4: a fresh playground for room temperature multiferroicity / Orlandi, Fabio; Delmonte, Davide; Calestani, Gianluca; Cavalli, Enrico; Gilioli, Edmondo; Shvartsman, Vladimir V.; Graziosi, Patrizio; Rampino, Stefano; Spaggiari, Giulia; Liu, Chao; Ren, Wei; Picozzi, Silvia; Solzi, Massimo; Casappa, Michele; Mezzadri, Francesco. - In: NATURE COMMUNICATIONS. - ISSN 2041-1723. - 13:(2022), p. 7968.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2936980
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