Enhanced ferroelectricity and ferromagnetism in Bi_0.9Ba_0.1FeO₃/La_2/3Sr_1/3MnO₃ heterostructure grown by pulsed laser deposition

Bi_0.9Ba_0.1FeO₃ (BBFO)/La_2/3Sr_1/3MnO₃ (LSMO) heterostructures are fabricated on LaAlO₃ (100) substrates by pulsed laser deposition. Giant remnant polarization value (～ 85 μC/cm²) and large saturated magnetization value (～ 12.4 emu/cm³) for BBFO/LSMO heterostructures are demonstrated at room temperature. Mixed ferroelectric domain structures and low leakage current are observed and in favor of enhanced ferroelectric properties in the BBFO/LSMO heterostructures. The magnetic field-dependent magnetization measurements reveal the enhancement in the magnetic moment and improved magnetic hysteresis loop originating from the BBFO/LSMO interface. The heterostructure is proved to be effective in enhancing the ferroelectric and ferromagnetic performances in multiferroic BFO films at room temperature.