Room Temperature Magnetically Ordered Polar Corundum GaFeO₃ Displaying Magnetoelectric Coupling

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Niu, Hongjun, Pitcher, Michael J, Corkett, Alex J, Ling, Sanliang, Mandal, Pranab, Zanella, Marco ORCID: 0000-0002-6164-6169, Dawson, Karl ORCID: 0000-0003-3249-8328, Stamenov, Plamen, Batuk, Dmitry, Abakumov, Artem M et al (show 8 more authors) , Bull, Craig L, Smith, Ronald I, Murray, Claire A, Day, Sarah J, Slater, Ben, Cora, Furio, Claridge, John B ORCID: 0000-0003-4849-6714 and Rosseinsky, Matthew J ORCID: 0000-0002-1910-2483 (2017) Room Temperature Magnetically Ordered Polar Corundum GaFeO₃ Displaying Magnetoelectric Coupling JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 139 (4). pp. 1520-1531. ISSN 0002-7863, 1520-5126

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Abstract

The polar corundum structure type offers a route to new room temperature multiferroic materials, as the partial LiNbO<inf>3</inf>-type cation ordering that breaks inversion symmetry may be combined with long-range magnetic ordering of high spin d⁵ cations above room temperature in the AFeO<inf>3</inf> system. We report the synthesis of a polar corundum GaFeO<inf>3</inf> by a high-pressure, high-temperature route and demonstrate that its polarity arises from partial LiNbO<inf>3</inf>-type cation ordering by complementary use of neutron, X-ray, and electron diffraction methods. In situ neutron diffraction shows that the polar corundum forms directly from AlFeO<inf>3</inf>-type GaFeO<inf>3</inf> under the synthesis conditions. The A³⁺/Fe³⁺ cations are shown to be more ordered in polar corundum GaFeO<inf>3</inf> than in isostructural ScFeO<inf>3</inf>. This is explained by DFT calculations which indicate that the extent of ordering is dependent on the configurational entropy available to each system at the very different synthesis temperatures required to form their corundum structures. Polar corundum GaFeO<inf>3</inf> exhibits weak ferromagnetism at room temperature that arises from its Fe<inf>2</inf>O<inf>3</inf>-like magnetic ordering, which persists to a temperature of 408 K. We demonstrate that the polarity and magnetization are coupled in this system with a measured linear magnetoelectric coupling coefficient of 0.057 ps/m. Such coupling is a prerequisite for potential applications of polar corundum materials in multiferroic/magnetoelectric devices. (Graph Presented).

Item Type:	Article
Uncontrolled Keywords:	3402 Inorganic Chemistry, 34 Chemical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	03 Jan 2017 10:21
Last Modified:	23 May 2026 00:37
DOI:	10.1021/jacs.6b11128
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3005045
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