Multiferroic behavior and impedance spectroscopy of bilayered BiFeO{sub 3}/CoFe{sub 2}O{sub 4} thin films
- Department of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, Singapore 117574 (Singapore)
Lead-free bilayered multiferroic thin films consisting of BiFeO{sub 3} (BFO) and CoFe{sub 2}O{sub 4} (CFO) layers with different thicknesses were grown on SrRuO{sub 3}-coated Pt/TiO{sub 2}/SiO{sub 2}/Si substrates by radio frequency sputtering. The effects of constituent layer thicknesses on the ferroelectric and magnetic behavior have been studied. The physical behaviors are shown to strongly depend on the thicknesses of the constituent layers. BFO (220 nm)/CFO (30 nm) bilayered thin film demonstrated much improved ferroelectric and ferromagnetic behavior (2P{sub r}=144.2 muC/cm{sup 2}, 2E{sub c}=778.0 kV/cm, M{sub s}=61.2 emu/cm{sup 3}, and H{sub c}=200.8 Oe) as compared to those of the single layer BFO thin film. The dielectric behavior and conductivity of BFO (220 nm)/CFO (30 nm) bilayered thin film were investigated as a function of both temperature (in the range of 294-534 K) and frequency (in the range of 10{sup -1}-10{sup 6} Hz), where an activation energy of approx1.11 eV for dielectric relaxation was demonstrated. From the conductivity behavior, an activation energies of approx0.98 eV was derived for dc conductivity are, implying that oxygen vacancies are involved in the conduction of the BFO (220 nm)/CFO (30 nm) bilayered film.
- OSTI ID:
- 21352263
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 12 Vol. 105; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACTIVATION ENERGY
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
CHALCOGENIDES
COBALT COMPOUNDS
COBALT OXIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DEPOSITION
DIELECTRIC MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY
FERROELECTRIC MATERIALS
FERROMAGNETIC MATERIALS
FILMS
IMPEDANCE
LAYERS
MAGNETIC MATERIALS
MATERIALS
METALS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PLATINUM
PLATINUM METALS
POINT DEFECTS
RADIATIONS
RADIOWAVE RADIATION
SILICON COMPOUNDS
SILICON OXIDES
SPECTROSCOPY
SPUTTERING
STRONTIUM COMPOUNDS
SUBSTRATES
THIN FILMS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VACANCIES