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Leakage Current Behaviors of SrTiO3/BiFeO3 Multi-Layers Fabricated by Pulsed Laser Deposition

It has been well known that BiFeO3 (BFO) exhibits two interesting physical properties simultaneously, which invoked multi-ferroic device applications to change electrical properties by controlling magnetic properties of BFO or vice versa. However, BFO has a high leakage current density, which may be attributed to bismuth and/or oxygen vacancies in the structure. In order to reduce the leakage current, a thin layer of dielectric SrTiO3 (STO) has been deposited on the top of BFO films by pulsed laser deposition. Improvement in leakage current and remnant polarization was observed in the STO capped BFO thin films.