Enhancement of switching speed of BiFeO3 capacitors by magnetic fields | Zendy

ErJia Guo | Zendy; Sujit Das | Zendy; Andreas Herklotz | Zendy

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Enhancement of switching speed of BiFeO3 capacitors by magnetic fields

Author(s) -

ErJia Guo,

Sujit Das,

Andreas Herklotz

Publication year - 2014

Publication title -

apl materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.571

H-Index - 60

ISSN - 2166-532X

DOI - 10.1063/1.4894758

Subject(s) - materials science , capacitor , magnetoresistance , ferroelectricity , coercivity , switching time , condensed matter physics , curie temperature , magnetic field , electrode , polarization (electrochemistry) , voltage , optoelectronics , ferromagnetism , electrical engineering , dielectric , chemistry , physics , quantum mechanics , engineering

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

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