[36] Multiferroic properties of highly c-oriented BiFeO₃ thin films on glass substrates

BiFeO₃ (BFO) thin films were deposited on SrRuO₃ (SRO)/yttria-stabilized zirconia (YSZ)/glass substrates by pulsed laser deposition. To grow highly alpha- and (110)-oriented SRO bottom electrodes, we used YSZ buffer layers between SRO bottom electrodes and glass substrates. On the highly alpha- and (110)-oriented SRO bottom electrodes, we obtained highly c- and (011)-oriented BFO thin films in which the structures of BFO thin films were confirmed by X-ray diffraction experiments. The highly -oriented BFO thin film exhibited a higher ferroelectric polarization (about 40 uC/cm²) than the highly (011)-oriented BFO thin film. The highly c-oriented BFO thin film also showed a ferromagnetic hysteresis loop while the highly (011)-oriented BFO thin film exhibited a superparamagnetic hysteresis loop.