Pulsed Laser Deposition and Characterization of Sr and Zn Co-Substituted BiFeO3 Thin Films

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Bi1.1SrxFe0.9Zn0.1O3 ($x=0.05,0.1$) (BSFZO), Bi1.1SrxFe0.9O3 ($x=0.05,0.1$) (BSFO), and Bi1.1Fe0.9Zn0.1O3 (BFZO) thin films have been prepared on Pt/TiO2/SiO2/Si substrates by pulsed laser deposition, and their ferroelectric and ferromagnetic properties have been characterized. X-ray diffraction (XRD) patterns of BSFO and BFZO thin films show a peroveskite single phase and BSFO thin films show shifting and splitting of peaks with increasing fraction of Sr. The BFZO thin film shows a lower leakage current than the BFO thin film and their $P$–$E$ and $M$–$H$ hysteresis loops are obtained. The XRD peaks of BSFZO thin films also shift to an angle lower than that of BFO thin films. The $P$–$E$ hysteresis loop is obtained at 80 K and the reamanent polarizations of the Bi1.1SrxFe0.9Zn0.1O3 thin film are 79 and 58 μC/cm2 for $x=0.05$ and 0.1, respectively. The $M$–$H$ hysteresis loop is also obtained at 80 K and the reamanent magnetization and coercive field are 1.1 and 6 emu/cm3, and 222 and 792 Oe at a maximum magnetic field of 10 kOe for $x=0.05$ and 0.1, respectively.
2009-09-25