title: Effects of oxygen vacancy on the electronic structure and multiferroics in sol-gel derived Pb(0.8)Co(0.2)TiO3 thin films.
abstract: The single phase Pb(0.8)Co(0.2)TiO3 thin films were synthesized on a Pt/Ti/SiO2/Si substrate by the sol-gel route. The present films exhibited homogeneous microstructure with low porosity. O 1s X-ray photoelectron spectroscopy (XPS) was used to detect the amount of oxygen vacancies. The ferroelectric measurements showed that the ferroelectricity deteriorates with the increase in the number of oxygen vacancies. X-ray absorption spectroscopy (XAS) and XPS were used to study the electronic structure. The results indicated that the decreased ferroelectricity might be ascribed to the weakened hybridization between O 2p and Pb 6s and Ti 3d orbitals. The ferromagnetic behaviors were also observed in the thin films and saturated magnetization raised monotonously with the oxygen vacancy rising due to the enhanced F-center exchange interaction. Magnetoelectric coupling of the films weakened with oxygen vacancy increase.
authors.affiliation: Department of Physical Chemistry, State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, P. R. China.
authors.forename: Hanqing
authors.initials: H
authors.lastname: Zhao
authors.forename: Jiaou
authors.initials: J
authors.lastname: Wang
authors.forename: Linxing
authors.initials: L
authors.lastname: Zhang
authors.forename: Yangchun
authors.initials: Y
authors.lastname: Rong
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.forename: Kurash
authors.initials: K
authors.lastname: Ibrahim
authors.forename: Xianran
authors.initials: X
authors.lastname: Xing