title: Structure Evolution and Multiferroic Properties in Cobalt Doped Bi4NdTi3Fe1-xCoxO15-Bi3NdTi2Fe1-xCoxO12-δIntergrowth Aurivillius Compounds.
abstract: Here, we report the structure evolution, magnetic and ferroelectric properties in Co-doped 4- and 3-layered intergrowth Aurivillius compounds Bi4NdTi3Fe1-xCoxO15-Bi3NdTi2Fe1-xCoxO12-δ. The compounds suffer a structure evolution from the parent 4-layered phase (Bi4NdTi3FeO15) to 3-layered phase (Bi3NdTi2CoO12-δ) with increasing cobalt doping level from 0 to 1. Meanwhile the remanent magnetization and polarization show opposite variation tendencies against the doping level, and the sample with x = 0.3 has the largest remanent magnetization and the smallest polarization. It is believed that the Co concentration dependent magnetic properties are related to the population of the Fe3+-O-Co3+bonds, while the suppressed ferroelectric polarization is due to the enhanced leakage current caused by the increasing Co concentration. Furthermore, the samples (x = 0.1-0.7) with ferromagnetism show magnetoelectric coupling effects at room temperature. The results indicate that it is an effective method to create new multiferroic materials through modifying natural superlattices.
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, China.
authors.forename: D L
authors.initials: DL
authors.lastname: Zhang
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, China.
authors.forename: W C
authors.initials: WC
authors.lastname: Huang
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, China.
authors.forename: Z W
authors.initials: ZW
authors.lastname: Chen
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, China.
authors.forename: W B
authors.initials: WB
authors.lastname: Zhao
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, China.
authors.forename: L
authors.initials: L
authors.lastname: Feng
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, China.
authors.forename: M
authors.initials: M
authors.lastname: Li
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, China.|Department of Physics and Astronomy, University of Nebraska, Lincoln, NE 68588, USA.
authors.forename: Y W
authors.initials: YW
authors.lastname: Yin
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, China.
authors.forename: S N
authors.initials: SN
authors.lastname: Dong
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, China.|Key Laboratory of Materials Physics, Institute of Solid State Physics, CAS, Hefei 230026, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
authors.forename: X G
authors.initials: XG
authors.lastname: Li