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Author Kumar, Shalendra ♦ Song, T. K. ♦ Gautam, Sanjeev ♦ Chae, K. H. ♦ Kim, S. S. ♦ Jang, K. W.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword NANOSCIENCE AND NANOTECHNOLOGY ♦ ABSORPTION SPECTROSCOPY ♦ COBALT ADDITIONS ♦ DOPED MATERIALS ♦ ELECTRONIC STRUCTURE ♦ FERROMAGNETISM ♦ FOURIER TRANSFORM SPECTROMETERS ♦ HYSTERESIS ♦ INFRARED SPECTRA ♦ MAGNETIC CIRCULAR DICHROISM ♦ MAGNETIC PROPERTIES ♦ MAGNETIZATION ♦ NANOPARTICLES ♦ NANOSTRUCTURES ♦ SCANNING ELECTRON MICROSCOPY ♦ SYNTHESIS ♦ TRANSMISSION ELECTRON MICROSCOPY ♦ X-RAY DIFFRACTION ♦ X-RAY SPECTROSCOPY ♦ ZINC OXIDES
Abstract Highlights: • XRD and HR-TEM results show the single phase nature of Co doped ZnO nanoparticles. • XMCD and dc magnetization results indicate the RT-FM in Co doped ZnO nanoparticles. • Co L{sub 3,2} NEXAFS spectra infer that Co ions are in 2+ valence state. • O K edge NEXAFS spectra show that O vacancy increases with Co doping in ZnO. - Abstract: We reported structural, magnetic and electronic structure studies of Co doped ZnO nanoparticles. Doping of Co ions in ZnO host matrix has been studied and confirmed using various methods; such as X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy dispersed X-ray (EDX), high resolution transmission electron microscopy (HR-TEM), Fourier transform infrared spectroscopy (FT-IR), near edge X-ray absorption fine structure (NEXAFS) spectroscopy, magnetic hysteresis loop measurements and X-ray magnetic circular dichroism (XMCD). From the XRD and HR-TEM results, it is observed that Co doped ZnO nanoparticles have single phase nature with wurtzite structure and exclude the possibility of secondary phase formation. FE-SEM and TEM micrographs show that pure and Co doped nanoparticles are nearly spherical in shape. O K edge NEXAFS spectra indicate that O vacancies increase with Co doping. The Co L{sub 3,2} edge NEXAFS spectra revealed that Co ions are in 2+ valence state. DC magnetization hysteresis loops and XMCD results clearly showed the intrinsic origin of temperature ferromagnetism in Co doped ZnO nanoparticles.
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-06-15
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 66


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