Growth of La 0.35 Pr 0.35 Ca 0.3 MnO 3 /LaAlO 3 Thin Film using Laser Molecular-Beam Epitaxy and its Magnetic Properties

We successfully grew (LPCMO)/(LAO) thin film using Laser Molecular-Beam Epitaxy and studied post-growth annealing effects (, 5 h) on its crystal structural and magnetic properties. Whereas the single-layered LPCMO and LPCMO/STO superlattice thin films show rough surface before and after the post-growth annealing, LPCMO/LAO superlattice shows a relatively very flat surface even after the post-growth annealing. The enhancement of ferromagnetism of LPCMO/LAO superlattice after the post-growth annealing was remarkable compared to the single-layered LPCMO thin film. The coercive and saturation magnetic field of the single-layed LPCMO thin film were decreased after the post-annealing. However, for LPCMO/LAO superlattice, a same coercive and increased saturation magnetic field were exhibited after post-growth annealing. We suggest that these peculiar observations are originate from the super-structure of LPCMO and LAO.