Two La0.7Ca0.3MnO3(35 nm)/La0.7Sr0.3MnO3(30 nm) manganite bilayers were grown on LaAlO3(LAO) and Al2O3(ALO) substrates (i.e., the LCMO/LSMO/LAO and LCMO/LSMO/ALO samples) using a magnetron sputtering technique. The individual Curie temperatures of the LSMO and LCMO sublayers were 325 K, 225 K for the LCMO/LSMO/LAO sample and 325 K, 210 K for the LCMO/LSMO/ALO sample. The zero-field-cooled (ZFC) magnetization of the samples demonstrated maximums at ∼150 K and ∼170 K, respectively. The difference between the ZFC and field-cooled (FC) magnetizations was greater for the bilayer deposited on ALO substrate due to its polycrystalline nature. The coercive field of the LCMO/LSMO/LAO sample was greater at room temperature 298 K than at 150 K: This was interpreted as due to a change of the magnetic state of the LCMO sublayer in this temperature interval.