Fabrication and Crystal Structure of [ABO3 /REMO3] (A=Ca, La, B=Fe, Mn, RE=Bi, La, M=Fe, Fe0.8Mn0.2) Superlattices Grown by Pulsed Laser Deposition Method

In this study, we aim to synthesize novel materials that show ferromagnetic and ferroelectric properties with the magnetoelectric effect at room temperature. Nine types of superlattice were fabricated by stacking [7 units — ABO3/7 units — REMO3] for 14 times by pulsed laser deposition. From all reciprocal space mappings (RSMs) of the CaMnO3 (CMO) superlattices, the satellite peaks were clearly observed. The calculated in-plain lattice parameter was 0.382 nm longer than 0.3732 nm, which is the bulk CMO and in-plain lattice parameter of the CMO thin film grown on SrTiO3 (001) substrate. All the CaFeO3 (CFO) series superlattices showed that the satellite peaks and Laue oscillations were clearly observed from the XRD 2θ–θ spectra. In the case of [CFO/BiFeO3 (BFO)] superlattices, the number of deposited units of CFO in [CFO/BFO] one cycle was 6.94, which was quite close to the seven units that we aimed. The in-plain lattice constant of all the CFO series superlattices was fitted to that of the substrate. From RSMs of the [LaMnO3 (LMO)/BFO] superlattice, the lattice parameter of the superlattice was fitted to that of the substrate in-plain. The cube-on-cube growth was confirmed in these LMO series superlattices