Origin of anomalous magnetite properties in crystallographic matched heterostructures: Fe3O4(111)/MgAl2O 4(111)

D. Gilks, L. Lari, J. Naughton, O. Cespedes, Z. Cai, A. Gerber, S. M. Thompson, K. Ziemer, V. K. Lazarov

Research output: Contribution to journalArticlepeer-review

Abstract

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 shifts determine the atomic structure of the observed APBs. The dominant non-bulk superexchange interactions are between 180° octahedral-Fe/O/octahedral-Fe sites which provide strong antiferromagnetic coupling across the defect interface resulting in non-bulk magnetic and magnetotransport properties.

Original languageEnglish
Article number485004
JournalJournal of Physics Condensed Matter
Volume25
Issue number48
DOIs
StatePublished - 4 Dec 2013

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