Study on Dielectric, Ferroelectric, and Magnetic Properties of 0.5 LaFe0.5Co0.5O3-Bi4Ti3O12 Multiferroic Thin Films

0.5LaFe
_0.5
Co
_0.5
O
₃
-Bi
₄
Ti
₃
O
₁₂
thin films were prepared via the sol–gel method on (111)Pt/Ti/SiO
₂
/Si(100) substrates. The thin films have a single-phase Aurivillius perovskite structure with a space group
Fmm2
under X-ray diffraction analysis. As expected, the coexistence of ferromagnetic and ferroelectric properties was spotted at room temperature. The remanent polarization (
$2P_{r}$
) and the saturated magnetization (
$M_{s}$
) are
$48~\mu \text{C}$
/cm
²
and 2.0 emu/cm
³
, respectively. Then, the magnetodielectric effect was observed at room temperature with a magnetodielectric coefficient of 0.75% under a small magnetic field of 0.5 T. Besides, two dielectric relaxation behaviors were observed, which were connected with the coexistence of Fe
²⁺
as well as Fe
³⁺
and existence of oxygen vacancy in the thin films, respectively.