Origin of anomalous magnetite properties in crystallographic matched heterostructures: Fe3O4(111)/MgAl2O4(111)

Daniel Gilks, Leonardo Lari, James Naughton, O Cespedes, Z Cai, A Gerber, Sarah Madeleine Thompson, K Zeimer, Vlado Lazarov

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Magnetite films grown on crystallographically matched substrates such as MgAl2O4 are not expected to show anomalous properties such as negative magnetoresistance and high saturation fields. By atomic resolution imaging using scanning transmission electron microscopy we show direct evidence of anti-phase domain boundaries (APB) present in these heterostructures. Experimentally identified 1/4<10-1> shifts determine the atomic structure of the observed APBs. The dominant non-bulk superexchange interactions are between 180o octahedral-Fe/O/octahedral-Fe sites which provide strong antiferromagnetic coupling across the defect interface resulting in non-bulk magnetic and magneto transport properties.

Original languageEnglish
Article number485004
Number of pages8
JournalJournal of physics : Condensed matter
Issue number48
Early online date31 Oct 2013
Publication statusPublished - 4 Dec 2013

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