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Interface engineering in complex oxide heterostructures has developed into aflourishing field as various intriguing physical phenomena can be demonstratedwhich are otherwise absent in their constituent bulk compounds. Here we presentLa$_{0.7}$Sr$_{0.3}$MnO$_3$ (LSMO) / Sm$_{0.5}$Ca$_{0.5}$MnO$_3$ (SCMO) basedheterostructures showcasing the dominance of antiferromagnetic interaction withincreasing interfaces. In particular, we demonstrate that exchange bias can betuned by increasing the number of interfaces; while, on the other hand,electronic phase separation can be mimicked by creating epitaxial multilayersof such robust charge ordered antiferromagnetic (CO-AF) and ferromagnetic (FM)manganites with increased AF nature, which otherwise would requireintrinsically disordered mixed phase materials. The origin of these phenomenais discussed in terms of magnetic interactions between the interfacial layersof the LSMO/SCMO. A theoretical model has been utilized to account for theexperimentally observed magnetization curves in order to draw out the complexinterplay between FM and AF spins at interfaces with the onset of chargeordering.

Tailoring the interfacial magnetic interaction in epitaxial La$_{0.7}$Sr$_{0.3}$MnO$_3$/Sm$_{0.5}$Ca$_{0.5}$MnO$_3$ heterostructures