Abstract
The effect of a magnetic field on the ferroelectric switching kinetics of BiFeO3 (BFO) capacitors with La0.8Ca0.2MnO3 (LCMO) bottom electrode and Pt top contact has been investigated. We find a strong dependence of the remnant polarization and coercive field on the magnetic field. The switching time can be systematically tuned by magnetic field and reaches a tenfold reduction around the Curie temperature of LCMO at 4 T. We attribute this behavior to the splitting of the voltage drops across the BFO film and the LCMO bottom electrode, which can be strongly influenced by an external magnetic field due to the magnetoresistance. Further experiments on the BFO capacitors with SrRuO3 bottom electrodes show little magnetic field dependence of ferroelectric switching confirming our interpretation. Our results provide an efficient route to control the ferroelectric switching speed through the magnetic field, implying potential application in multifunctional devices.
Highlights
Tuning of magnetism by an electric field or the ferroelectricity by a magnetic field in the multiferroic materials has been attractive for both device application and fundamental physics
We have shown that switching speed aAuthor to whom correspondence should be addressed
We explore the effects of magnetic field on the ferroelectric switching time of BFO
Summary
Tuning of magnetism by an electric field or the ferroelectricity by a magnetic field in the multiferroic materials has been attractive for both device application and fundamental physics. Enhancement of switching speed of BiFeO3 capacitors by magnetic fields
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