Exploring single phase with ferroelectric and ferromagnetic/ferromagnetic properties simultaneously at ambient temperature is one of the key problems in the research of multiferroic materials. It is also a prerequisite for the study of coupling mechanism between ferroelectric and magnetic orderings. In this work, we explore the multiferroic property in n-LaFeO₃-Bi₄Ti₃O₁₂, n-BiFeO₃-Bi₄Ti₃O₁₂ thin films. The c-axis epitaxially 0.5-LaFeO₃-Bi₄Ti₃O₁₂, 1.0-LaFeO₃-Bi₄Ti₃O₁₂ and 1.5-LaFeO₃-Bi₄Ti₃O₁₂, 2.0-LaFeO₃-Bi₄Ti₃O₁₂ and 2.5-LaFeO₃-Bi₄Ti₃O₁₂ thin films were successfully synthesized by pulsed laser deposition. X-ray diffraction, atomic-force-microscopy and transmission-electron-microscopy (TEM) characterization substantiate that all of these films have good crystalline quality. The temperature-dependence of magnetization under zero-field and field-cooling conditions show that there is anti-ferromagnetic interaction in these films. But for 0.5-LaFeO₃ and 1.5-LaFeO₃-Bi₄Ti₃O₁₂, magnetic hysteresis loop measurement proves that these films do have ferrimagnetic property. Based on the crystal structure of n-LaFeO₃-Bi₄Ti₃O₁₂, the observed ferrimagnetic property is discussed qualitatively. At the same time, the ferroelectric hysteresis loop measurement proves that there is ferroelectric property along the c-axis at ambient temperature. Thus, these films (0.5-LaFeO₃-Bi₄Ti₃O₁₂ and 1.5-LaFeO₃-Bi₄Ti₃O₁₂) have multiferroic property at the ambient temperature. But in n-BiFeO₃-Bi₄Ti₃O₁₂ series, highly leakage current and quite weak magnetism are observed. By means of TEM, the structural stability of n-LaFeO₃, n-BiFeO₃ and n-SrTiO₃ were characterized. It shows that n being as high as 3, there is high intergrowth density in n-SrTiO₃-Bi₄Ti₃O₁₂, while n-BiFeO₃-Bi₄Ti₃O₁₂ still keeps intact structure. Structure of n-LaFeO₃-Bi₄Ti₃O₁₂ is the most un-stable, it has collapsed Aurivillius structure when n is equal to 2.5. The feature of structure stability can be captured by the first principle calculations. This work provides a novel material system for exploring the devices based on multiferroic materials and studying the coupling mechanism between ferroelectric and ferromagnetic orderings. 

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