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