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A polar corundum oxide displaying weak ferromagnetism at room temperature.

Li, MR; Adem, U; McMitchell, SR; Xu, Z; Thomas, CI; Warren, JE; Giap, DV; (2012) A polar corundum oxide displaying weak ferromagnetism at room temperature. J Am Chem Soc , 134 (8) pp. 3737-3747. 10.1021/ja208395z.

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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).

Type: Article
Title: A polar corundum oxide displaying weak ferromagnetism at room temperature.
Location: United States
DOI: 10.1021/ja208395z
Keywords: Aluminum Oxide, Ferric Compounds, Magnetic Phenomena, Membranes, Artificial, Oxides, Scandium, Temperature
UCL classification: UCL > School of BEAMS > Faculty of Maths and Physical Sciences
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry
URI: http://discovery.ucl.ac.uk/id/eprint/1345504
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