Thickness-Dependent Magnetocapacitance of Ni0.98Co0.02Fe2O4/BaTiO3/Ni0.98Co0.02Fe2O4 Trilayers

Abstract

We report the fabrication of a multilayer magnetocapacitor from the highly magnetostrictive material Ni 0.98 Co 0.02 Fe 2 O 4 . To fabricate the magnetocapacitor, Ni 0.98 Co 0.02 Fe 2 O 4 /BaTiO 3 /Ni 0.98 Co 0.02 Fe 2 O 4 sandwich-type multilayer thin films were deposited on Pt/TiO 2 /SiO 2 /Si(100) substrates by pulsed laser deposition. We studied the crystal structures, the surface and interface microstructures, and the magnetic and electric properties of multilayer thin films with different thickness of Ni 0.98 Co 0.02 Fe 2 O 4 (20, 60, and 150 nm) and BaTiO 3 (100, 300, and 1000 nm).