Magneto-Dielectric Properties of Epitaxial Ba(Fe_(0.5)Sn_(0.5))O_(3-δ) Thin Films on (001) SrTiO_3 Substrates by Pulsed Laser Deposition

摘要

Epitaxial thin films of a novel magneto-dielectric perovskite compound, Ba(Fe_(0.5)Sn_(0.5))O_(3-δ)(BFSO), have been synthesized on (001) SrTiO_3 single crystalline substrates. The BFSO thin films have ferromagnetic nature, with saturation magnetization of 34 emu/cc at 300 K. The origin of the ferromagnetic nature of BFSO is the superexchange coupling of Fe~(4+)(d~4)-O~(2-)- Fe~(4+)(d~4). Electrical conduction in BFSO can be determined to be space charge limited type conduction, but the leakage current increased under high electric fields.