Abstract
Multilayer superlattices consisting of multiferroicBi2NiMnO6 (BNMO)and La2NiMnO6 (LNMO) have been grown heteroepitaxially on pure and Nb-dopedSrTiO3 substrates using the pulsed laser deposition technique. In a series of superlatticestructures grown with a fixed BNMO layer thickness of ten unit cells, we find that thec-axis lattice parameter, Curie temperature and magnetocapacitance are stronglydependent upon the number of stacked LNMO unit cells in the repeating units. Thethickness-dependent magnetodielectric effect is attributed to the fluctuations in electric andmagnetic dipole ordering due to the substrate and interface induced stress in thesuperlattice structures. An enhanced magnetodielectric effect in multilayers with LNMOthicknesses larger than six unit cells is explained based on possible canting of spin at theinterfaces of LNMO and BNMO.
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