Magnetoresistance enhancement in epitaxial magnetite films grown on vicinal substrates
Citation:
Arora, S. K.; Sofin, R. G. S.; Shvets, I. V., Magnetoresistance enhancement in epitaxial magnetite films grown on vicinal substrates, Physical Review B (Condensed Matter and Materials Physics), 72, 2005, 134404 - 134410Download Item:
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 2 T for a 45 nm Fe3
O4 film on high-vicinal substrate than that observed 7.2% at 2 T 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.
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Grant Number
Science Foundation Ireland (SFI)
Author's Homepage:
http://people.tcd.ie/ivchvetsDescription:
PUBLISHED
Author: SHVETS, IGOR; ARORA, SUNIL
Type of material:
Journal ArticleCollections
Series/Report no:
Physical Review B (Condensed Matter and Materials Physics)72
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Surface Physics, thin filmsMetadata
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