Abstract
We have combined neutron scattering and piezoresponse force microscopy to show that the exchange field in heterostructures scales with the inverse of the ferroelectric and antiferromagnetic domain size of the films, as expected from Malozemoff’s model of exchange bias extended to multiferroics. Accordingly, polarized neutron reflectometry reveals the presence of uncompensated spins in the film at the interface with CoFeB. In view of these results, we discuss possible strategies to switch the magnetization of a ferromagnet by an electric field using .
- Received 6 September 2007
DOI:https://doi.org/10.1103/PhysRevLett.100.017204
©2008 American Physical Society