Electronic, Magnetic, and Ferroelectric Properties of Bi0.9La0.1Fe0.9Mn0.1O3/La0.8Sr0.2MnO3: Experimental and First-Principles Calculations Studies

We focus on the electronic, magnetic, and ferroelectric properties of the bilayer composite, Bi0.9La0.1Fe0.9Mn0.1O3/La0.8Sr0.2MnO3 (BFO-LM/LSMO). The studied films were processed on a Pt-substrate using chemical solution deposition. The morphology and structure purity of the synthesized films were characterized by field-emission scanning electron microscopy (FE-SEM) and x-ray diffraction (XRD). In addition, the simultaneous presence of macroscopic polarization and a fairly high magnetization were highlighted for the investigated specimen. In addition, the stability and electronic and magnetic properties of the BFO-LM/LSMO bilayer films with different stacking patterns have been explored using first-principles calculations. Moreover, the interfacial separation work for the Fe and Mn atoms at the interface in the BFO-LM/LSMO bilayer are 0.2069 J/m2 and 1.0309 J/m2, respectively, indicating that these systems have high stability, which is due to the strong hybridizations of the Fe_d, Mn_d, and O_p states at the interface. The interactions between the Fe and Mn spins at the interface lead to enhancing the remnant and saturation magnetizations in this system. The obtained results make BFO-LM/LSMO films a promising material for advanced spintronics and multifunctional devices.