| Multiferroic materials are a class of materials that yield simultaneous ferroelectricity and ferromagnetism. They have a potential applications in information storage, spintronic devices and sensors. BiFeO3(BFO) is a perovskite typed mutiferrioc (Tc= 1103K, Tn=643K), which shows coexistent ferroelectricity and ferromagnetism at room temperature. CoFe2O4(CFO) is a kind of excellent ferromagnetic material because of its high cubic magnetocrystalline anisotropy, high coercivity and moderate saturation magnetization.In this paper, ferroelectric BFO and ferromagnetic CFO ceramic targets were prepared by the conventional solid-state method. The films of pure BFO, pure CFO and the heterostructure BFO/CFO composite were prepared on the substrates by rf magnetron sputtering. The structures, surface morphologies, ferroelectric and ferromagnetic characteristics of the films were investigated by XRD, AFM, Precision Premier II ferroelectric test system and VSM. Testing results reveal that the heterostructure films exhibit both ferroelectric and ferromagnetic behaviors at room temperature. And the coercive eletric field intensity (2Ec) and remanent polarization (2Pr) are 678 kV/cm and 77μC/cm2 under the polarization voltage 70V at room temperature, respectively, while the remanent magnetization (2Mr) and coercive magnetic field intensity (2Hc) are 154 emu/cm3 and 2.6 kOe, respectively.
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