  Using first-principles density functional theory calculations, we
investigated the electronic structure and magnetic properties of
(LaMnO$_3$)$_m$/(LaNiO$_3$)$_n$ superlattices stacked along (001)-direction.
The electrons are transferred from Mn to Ni, and the magnetic moments are
induced at Ni sites that are paramagnetic in bulk and other types of
superlattices. The size of induced moment is linearly proportional to the
amount of transferred electrons, but it is larger than the net charge transfer
because the spin and orbital directions play important roles and complicate the
transfer process. The charge transfer and magnetic properties of the ($m$,$n$)
superlattice can be controlled by changing the $m/n$ ratio. Considering the
ferromagnetic couplings between Mn and Ni spins and the charge transfer
characteristic, we propose the (2,1) superlattice as the largest moment
superlattice carrying $\sim8\mu_B$ per formula unit.
