Nano Archive

Nanoscale control of exchange bias with BiFeO3 thin films

Martin, Lane W. and Chu, Ying-Hao and Holcomb, Mikel B. and Huijben, Mark and Yu, Pu and Han, Shu-Jen and Lee, Donkoun and Wang, Shan X. and Ramesh, R. (2008) Nanoscale control of exchange bias with BiFeO3 thin films. NANO LETTERS, 8 (7). pp. 2050-2055.

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We demonstrate a direct correlation between the domain structure of multiferroic BiFeO3 thin films and exchange bias of Co0.9Fe0.1/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 (similar to 2 nm) domain walls in the BiFeO3 film. We show that the magnitude of the exchange bias interaction scales with the length of 109, ferroelectric domain walls in the BiFeO3 thin films which have been probed via piezoresponse force microscopy and X-ray magnetic circular dichroism.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nanomagnetics
Material Science > Nanostructured materials
Material Science > Nanochemistry
ID Code:2379
Deposited By:Anuj Seth
Deposited On:17 Dec 2008 13:53
Last Modified:17 Dec 2008 13:53

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