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Nanoscale control of exchange bias with BiFeO3 thin films.

TitleNanoscale control of exchange bias with BiFeO3 thin films.
Publication TypeJournal Article
Year of Publication2008
AuthorsMartin LW, Chu Y-H, Holcomb MB, Huijben M, Yu P, Han S-J, Lee D, Wang SX, Ramesh R
JournalNano Lett
Date Published2008 Jul

We demonstrate a direct correlation between the domain structure of multiferroic BiFeO3 thin films and exchange bias of Co 0.9Fe 0.1/BiFeO3 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 ( approximately 2 nm) domain walls in the BiFeO3 film. We show that the magnitude of the exchange bias interaction scales with the length of 109 degrees ferroelectric domain walls in the BiFeO 3 thin films which have been probed via piezoresponse force microscopy and X-ray magnetic circular dichroism.

Alternate JournalNano Lett.
PubMed ID18547121