  The emergence of magnetic reconstructions at the interfaces of oxide
heterostructures are often explained via subtle modifications in the electronic
densities, exchange couplings, or strain. Here an additional possible route for
induced magnetism is studied in the context of the
(LaNiO$_3$)$_n$/(LaMnO$_3$)$_n$ superlattices using a hybrid tight-binding
model. In the LaNiO$_3$ region, the induced magnetizations decouple from the
intensity of charge leakage from Mn to Ni, but originate from the spin-filtered
quantum confinement present in these nanostructures. In general, the induced
magnetization is the largest for the (111)-stacking and the weakest for the
(001)-stacking superlattices, results compatible with the exchange bias effects
reported by Gibert et al. Nat. Mater. 11, 195 (2012).
