Platinum-induced structural collapse in layered oxide polycrystalline films

Journal Article · Mon Mar 30 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4915507· OSTI ID:22398827

Wang, Jianlin; Liu, Changhui ^[1]; Huang, Haoliang ^[1]; Fu, Zhengping; Peng, Ranran ^[1]; Zhai, Xiaofang ^[2]; Lu, Yalin ^[1]

---

1. CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026 (China)
2. Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026 (China)

Effect of a platinum bottom electrode on the SrBi{sub 5}Fe{sub 1−x}Co{sub x}Ti{sub 4}O{sub 18} layered oxide polycrystalline films was systematically studied. The doped cobalt ions react with the platinum to form a secondary phase of PtCoO{sub 2}, which has a typical Delafossite structure with a weak antiferromagnetism and an exceptionally high in-plane electrical conductivity. Formation of PtCoO{sub 2} at the interface partially consumes the cobalt dopant and leads to the structural collapsing from 5 to 4 layers, which was confirmed by X-ray diffraction and high resolution transmission electron microscopy measurements. Considering the weak magnetic contribution from PtCoO{sub 2}, the observed ferromagnetism should be intrinsic of the Aurivillius compounds. Ferroelectric properties were also indicated by the piezoresponse force microscopy. In this work, the platinum induced secondary phase at the interface was observed, which has a strong impact on Aurivillius structural configuration and thus the ferromagnetic and ferroelectric properties.

• OSTI ID: 22398827
• Journal Information: Applied Physics Letters, Vol. 106, Issue 13; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
BISMUTH COMPOUNDS
COBALT IONS
COBALT OXIDES
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRODES
FERROELECTRIC MATERIALS
FERROMAGNETISM
FILMS
INTERFACES
IRON COMPOUNDS
LAYERS
PLATINUM
PLATINUM COMPOUNDS
POLYCRYSTALS
STRONTIUM TITANATES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION