Abstract
Effect of Ca substitution on the multiferroic properties of non-epitaxially grown polycrystalline Bi 1-x Ca x FeO 3 (BCFO) films on refined Pt(1 1 1) electrode buffered glass substrates is studied. The structural analysis shows that a pure perovskite phase with isotropic orientation is present for BCFO films (x = 0.05-0.15). The grain size and surface roughness are reduced with increasing x. Different from the BCFO ceramics, good ferroelectric properties with the remanent polarization (2P r ) of 91-124 μC/cm 2 and electrical coercive field (E c ) of 294-394 kV/cm are obtained in BCFO polycrystalline thin films. Furthermore, the substitution of Ca 2+ for Bi 3+ effectively enhance the ferromagnetic properties with magnetization (M s ) of 5.9-8.2 emu/cm 3 and coercivity (H c ) of 1224-1258 Oe. The ferromagnetic and ferroelectric properties and leakage behavior as functions of Ca content x are discussed.