Self-polarization Modulation of BiFeO3 Epitaxial Films
Through the investigation of the substrate/bottom electrode interface behavior,it is discovered that interface effects can modulate the polarization of BiFeO3 epitaxial films.As both the bottom electrode and the film possess perovskite-type structures,by altering the interface layer type and position of the substrate/bottom electrode,two different types of interfaces can be achieved in the BFO/SRO(LSMO)/STO heterostructure.XRD and RSM characterizations indicate that the BFO film grows epitaxially on the STO substrate.Combined with PFM characterization,the two heterostructure films exhibit upward/downward spontaneous polarization(Eb)and c-domain 180°flipping.These research findings reveal differences in charge distribution and the direc-tion of the built-in electric field at the interface of heterostructures caused by different choices of bottom elec-trodes,providing new strategies for modulating the performance of heterostructure devices.
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