Atomic-scale structure and properties of highly stable antiphase boundary defects in Fe3O4

Keith P. McKenna, Florian Hofer, Daniel Gilks, Vlado K. Lazarov, Chunlin Chen, Zhongchang Wang, Yuichi Ikuhara

    Research output: Contribution to journalArticlepeer-review

    70 Citations (Scopus)

    Abstract

    The complex and intriguing properties of the ferrimagnetic half metal magnetite (Fe3O4) are of continuing fundamental interest as well as being important for practical applications in spintronics, magnetism, catalysis and medicine. There is considerable speculation concerning the role of the ubiquitous antiphase boundary (APB) defects in magnetite, however, direct information on their structure and properties has remained challenging to obtain. Here we combine predictive first principles modelling with high-resolution transmission electron microscopy to unambiguously determine the three-dimensional structure of APBs in magnetite. We demonstrate that APB defects on the {110} planes are unusually stable and induce antiferromagnetic coupling between adjacent domains providing an explanation for the magnetoresistance and reduced spin polarization often observed. We also demonstrate how the high stability of the {110} APB defects is connected to the existence of a metastable bulk phase of Fe3O4, which could be stabilized by strain in films or nanostructures.

    Original languageEnglish
    Article number5740
    JournalNature communications
    Volume5
    DOIs
    Publication statusPublished - 2014

    ASJC Scopus subject areas

    • Chemistry(all)
    • Biochemistry, Genetics and Molecular Biology(all)
    • Physics and Astronomy(all)

    Fingerprint

    Dive into the research topics of 'Atomic-scale structure and properties of highly stable antiphase boundary defects in Fe<sub>3</sub>O<sub>4</sub>'. Together they form a unique fingerprint.

    Cite this