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American Chemical Society, Journal of the American Chemical Society, 8(134), p. 3737-3747, 2012

DOI: 10.1021/ja208395z

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A Polar Corundum Oxide Displaying Weak Ferromagnetism at Room Temperature

Journal article published in 2012 by Sean R. C. {McMitchell}, Man-Rong Li, Umut Adem, McMitchell Src, Sean R. C. McMitchell, Zhongling Xu, Thomas Ci, Warren Je, John E. Warren, Giap Dv, Chris I. Thomas, Duong V. Giap, Hongjun Niu, Xinming Wan, Robert G. Palgrave ORCID and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Combining long-range magnetic order with polarity in the same structure is a prerequisite for the design of (magnetoelectric) multiferroic materials. There are now several demonstrated strategies to achieve this goal, but retaining magnetic order above room temperature remains a difficult target. Iron oxides in the +3 oxidation state have high magnetic ordering temperatures due to the size of the coupled moments. Here we prepare and characterize ScFeO(3) (SFO), which under pressure and in strain-stabilized thin films adopts a polar variant of the corundum structure, one of the archetypal binary oxide structures. Polar corundum ScFeO(3) has a weak ferromagnetic ground state below 356 K-this is in contrast to the purely antiferromagnetic ground state adopted by the well-studied ferroelectric BiFeO(3).