Magnetoresistance enhancement in epitaxial magnetite films grown on vicinal substrates

S. K. Arora*, R. G S Sofin, I. V. Shvets

*Corresponding author for this work

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

The magnetoresistance (MR) behavior of epitaxial magnetite Fe3O4 grown on low-vicinal (small miscut) and high-vicinal (large miscut) MgO substrates is compared. Magnetization measurements on Fe3O4 films on high-vicinal substrates showed reduced magnetic moment as compared with the films grown on low-vicinal MgO, which correlates well with the expected reduction in magnetic moment due to step edge induced additional antiphase boundaries (APBs) with out-of-plane shift vectors. The MR is significantly higher (12.3% at 2T) for a 45nm Fe3O4 film on high-vicinal substrate than that observed (7.2% at 2T) for a film on low-vicinal substrate. A strong anisotropy in the MR is observed in correlation with the direction of atomic step edges. In addition to the increase in MR, the field dependency of the MR is also modified. The observed modification in the magnetotransport behavior of epitaxial Fe3O4 films is attributed to an enhanced spin scattering arising due to the presence of atomic height steps that lead to the formation of a greater density of antiferromagnetically coupled APBs.

Original languageEnglish
Article number134404
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number13
DOIs
Publication statusPublished - Oct 1 2005

ASJC Scopus subject areas

  • Condensed Matter Physics

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