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Author Ahmed, Raju ♦ Moslehuddin, A. S. M. ♦ Mahmood, Zahid Hasan ♦ Hossain, A. K. M. Akther
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ CHEMICAL COMPOSITION ♦ DIELECTRIC MATERIALS ♦ ELECTRIC CONDUCTIVITY ♦ FERROMAGNETISM ♦ FREQUENCY DEPENDENCE ♦ GRAIN SIZE ♦ MAGNETIC PROPERTIES ♦ MAGNETIC SEMICONDUCTORS ♦ MAGNETIZATION ♦ PARAMAGNETISM ♦ PERMITTIVITY ♦ RELAXATION LOSSES ♦ SCANNING ELECTRON MICROSCOPY ♦ SINTERING ♦ TEMPERATURE DEPENDENCE ♦ X-RAY DIFFRACTION ♦ ZINC OXIDES
Abstract Highlights: • Single phase wurtzite structure was confirmed from XRD analysis. • Weak ferromagnetic behaviour at room temperature. • Pure semiconducting properties confirmed from temperature dependent conductivity. • Smaller dielectric properties at higher frequency. • Possible potential application in high frequency spintronic devices. - Abstract: In this study the room temperature ferromagnetic behaviour and dielectric properties of ZnO based diluted magnetic semiconductor (DMS) have been investigated using nominal chemical composition Zn{sub 0.9}Ni{sub 0.1}O. The X-ray diffraction analysis confirmed formation of single phase hexagonal wurtzite structure. An increase in grain size with increasing sintering temperature was observed from scanning electron microscopy. Field dependent DC magnetization values indicated dominant paramagnetic ordering along with a slight ferromagnetic behaviour at room temperature. Frequency dependent complex initial permeability showed some positive values around 12 at room temperature. In dielectric measurement, an increasing trend of complex permittivity, loss tangent and ac conductivity with increasing temperature were observed. The temperature dependent dispersion curves of dielectric properties revealed clear relaxation at higher temperature. Frequency dependent ac conductivity was found to increase with frequency whereas complex permittivity and loss tangent showed an opposite trend.
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-03-15
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 63


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