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Title: Platinum-induced structural collapse in layered oxide polycrystalline films

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.
Authors:
;  [1] ;  [1] ;  [2] ; ;  [1] ;  [2] ;  [2] ;  [3] ;  [2] ;  [1] ;  [2] ;  [2] ;  [4]
  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. (China)
  3. Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026 (China)
  4. (United States)
Publication Date:
OSTI Identifier:
22398827
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 13; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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