%0 Journal Article
%K nanostructured materials
%K hysteresis
%K heterostructures
%K Domain walls
%K Ferroelectric materials
%K multiferroic
%K exchange bias
%K ferroelectricity
%K Ferroelectric domains
%K X ray crystallography
%K Dichroism
%K Coercive force
%K Cobalt
%K Magnetic domains
%K Semiconducting bismuth compounds
%K Domain structures
%K Nanoscale controls
%K Piezoresponse force microscopies
%K Magnetic thin films
%K Crystals
%K Coercive fields
%K Exchange enhancements
%K Large shifts
%K Nano-scale
%K X-ray magnetic circular dichroisms
%A L.W Martin
%A Y.-H Chu
%A M.B Holcomb
%A M Huijben
%A P Yu
%A S.-J Han
%A D Lee
%A S.X Wang
%A Ramamoorthy Ramesh
%B Nano Letters
%D 2008
%G eng
%P 2050-2055
%R 10.1021/nl801391m
%T Nanoscale control of exchange bias with BiFeO 3 thin films
%V 8
%X We demonstrate a direct correlation between the domain structure of multiferroic BiFeO 3 thin films and exchange bias of Co 0.9Fe 0.1/BiFeO 3 heterostructures. Two distinct types of interactions - an enhancement of the coercive field (exchange enhancement) and an enhancement of the coercive field combined with large shifts of the hysteresis loop (exchange bias) - have been observed in these heterostructures, which depend directly on the type and crystallography of the nanoscale (∼2 nm) domain walls in the BiFeO 3 film. We show that the magnitude of the exchange bias interaction scales with the length of 109° ferroelectric domain walls in the BiFeO 3 thin films which have been probed via piezoresponse force microscopy and X-ray magnetic circular dichroism. © 2008 American Chemical Society.