Magneto-Dielectric Properties of Epitaxial Ba(Fe_0.5Sn_0.5)O_3−δ Thin Films on (001) SrTiO₃ Substrates by Pulsed Laser Deposition

Abstract

Epitaxial thin films of a novel magneto-dielectric perovskite compound, Ba(Fe_0.5Sn_0.5)O_3−δ(BFSO), have been synthesized on (001) SrTiO₃ 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 Fe⁴⁺(d⁴)–O²⁻–Fe⁴⁺(d⁴). Electrical conduction in BFSO can be determined to be space charge limited type conduction, but the leakage current increased under high electric fields.