Non-ferromagnetic Insulating Interface Region in La _0.14 Pr _0.56 Sr _0.3 MnO ₃ /SrTiO ₃ and La _0.7 Ca _0.3 MnO ₃ /Gd _0.7 Ca _0.3 MnO ₃ Multilayers

Abstract

La0.14Pr0.56Sr0.3MnO3/SrTiO3 and La0.7Ca0.3MnO3/Gd0.7Ca0.3MnO3 multilayers have been fabricated by using pulsed laser deposition. The insulator–metal transition temperatures of the multilayers decrease with the decreasing thickness of the ferromagnetic layers. It is confirmed from the experiment and analysis that a non-ferromagnetic insulating region exists near the interface, which could not be attributed to the roughness of the growth surfaces and disorder of the ferromagnetic layers.