|Title||Nanoscale control of exchange bias with BiFeO3 thin films.|
|Publication Type||Journal Article|
|Year of Publication||2008|
|Authors||Martin LW, Chu Y-H, Holcomb MB, Huijben M, Yu P, Han S-J, Lee D, Wang SX, Ramesh R|
|Date Published||2008 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 Journal||Nano Lett.|