Structural, magnetic and optical studies of (Zn0.90Co0.05Ni0.05O) DMS

Dysprosium-(Dy) and cobalt (Co)-doped zinc oxide (ZnO) nanoparticles with various concentrations have been synthesized by simple chemical precipitation method. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray (EDAX) measurements were conducted respectively for the structural, morphological, and compositional investigation of the sample. XRD analysis indicated that diffraction peaks of all the samples can be indexed to the hexagonal wurtzite structure of ZnO. No secondary phases including Co and Dy ions were detected in the samples even for the highest doping concentrations of Dy. Average particle size is found to be 25-34 nm. Scanning electron microscope and transmission electron microscope analysis revealed that the dopant atoms of Co and Dy are homogeneously distributed in ZnO wurtzite structure. The samples were characterized by EDAX to confirm the expected stoichiometry. In the photoluminescence spectra, Dy co-doped samples show a violet emission along with a broad yellow emission due to the 4 F 9/2 -6 H 15/2 inner shell transitions of Dy 3+ ion. The photoluminescence (PL) enhancement process in Dy co-doped ZnO:Co is mainly due to Dy as a sensibilizer which could effectively enhance the luminescence intensity. Absorption spectra of dysprosium-(Dy) and cobalt (Co)-doped ZnO nanoparticles exhibited enhanced optical absorption in visible region. Magnetization measurements have shown that the particles have room temperature ferromagnetic behavior with relatively high coercive fields which are decreasing with the increase of doping concentration. The analysis of optical and magnetic properties shows that Co-and Dy-doped ZnO nanoparticles are a promising material for DMS application and have potential applications in optoelectronic devices.

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“…Yuan [15]. Yuksel Koseoglu has shown the RTFM behavior with relatively high coercive field in Co 0.1 Zn 0.9 O nanoparticles [16].…”

Section: Introductionmentioning

confidence: 99%

Influence of Co and Dy Doping on the Optical and Magnetic Properties of ZnO Nanoparticles for DMS Application

Thangeeswari

Murugasen

Velmurugan

2015

J Supercond Nov Magn

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“…The precipitates were washed several times to remove the water-soluble impurities and free reactants and dried at 100 • C for 10 h. The spongy contents were filtered, dried and then powdered. Heating treatments of the synthesized powders were conducted at 600 • C for 4 h, the synthesis methods used were previously applied for simple doping in ZnO like Mn doped ZnO [16] and double doping like Mn and Ni in ZnO [17].…”

Section: Methodsmentioning

confidence: 99%

Magnetic Properties of Zn0.8(Fe0.1,Co0.1)O Diluted Magnetic Semiconductors: Experimental and Theoretical Investigation

Mounkachi

Boujnah

Labrim

et al. 2012

J Supercond Nov Magn

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Structural and magnetic properties of Zn 0.8 (Fe 0.1 , Co 0.1 )O bulk diluted magnetic semiconductor have been investigated using X-ray diffraction (XRD) and magnetic measurements. TEM (Transmission Electron Microscopy) images confirmed the high crystallinity and grain size of Zn 0.8 (Fe 0.1 ,Co 0.1 )O powder, the samples were characterized by energy dispersive spectroscopy (EDS) to confirm the expected stoichiometry. This sample has been synthesized by co-precipitation route. The study of magnetization hysteresis loop measurements infers that the bulk sample of Zn 0.8 (Fe 0.1 ,Co 0.1 )O shows a well-defined hysteresis loop at T c (200 K) temperature, which reflects its ferromagnetic behavior. Hydrogenation treatment was used for the control of phase separation. Based on first-principles spin-density functional calculations, using the Korringa-Kohn-Rostoker method (KKR) combined with the coherent potential approximation (CPA), the ferromagnetic state energy was calculated and compared with the local-moment-disordered (LMD) state energy. The mechanism of hybridization and interaction between magnetic ions in Zn 0.8 (Fe 0.1 ,Co 0.1 )O is also investigated.

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“…The addition of carriers in doped ZnO is found to increase this ferromagnetic behavior. Appearance of secondary phases at high dopant concentration and high annealing temperature motivated the researchers towards simultaneous doping of two or more transition metal ions in ZnO [10]. The above discussion led the present work to explore the characteristic properties of Co and Cd codoped ZnO based DMS materials.…”

Section: Introductionmentioning

confidence: 93%

Investigation of Structural, Magnetic, and Optical Properties of ZnO Codoped with Co and Cd

Mustafa

Anjum

Waseem

et al. 2014

Advances in Condensed Matter Physics

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Co and Cd have been codoped in ZnO using a simple solid state reaction technique to synthesize dilute magnetic oxide semiconductors of composition Zn0.9Co0.1−xCdxO (x = 0.0-0.1with an increment of 0.02). Hexagonal wurtzite structure has been obtained for samples up tox = 0.06, using X-ray diffractometry. However, atx = 0.08and 0.1, secondary peak of CdO is observed. Raman spectra of the samples have been obtained in 200–800 cm−1range. UV-VIS spectrophotometer is used to study the optical properties, which shows that band gap energy decreases with the increase in Cd concentration. A weak ferromagnetic behavior was evident which decreased further by adding Cd in the series. Room temperature resistivity measurements performed using four-point probe technique showed that their values lie in the semiconductor range. Structural morphology of the samples has been investigated by a scanning electron microscope and grain size has been determined. Raman spectra and Fourier transform infrared spectroscopy revealed the successful incorporation of Co and Cd ions into the host ZnO lattice.

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Structural, magnetic and optical studies of (Zn0.90Co0.05Ni0.05O) DMS

Cited by 44 publications

References 18 publications

Influence of Co and Dy Doping on the Optical and Magnetic Properties of ZnO Nanoparticles for DMS Application

Influence of Co and Dy Doping on the Optical and Magnetic Properties of ZnO Nanoparticles for DMS Application

Magnetic Properties of Zn0.8(Fe0.1,Co0.1)O Diluted Magnetic Semiconductors: Experimental and Theoretical Investigation

Investigation of Structural, Magnetic, and Optical Properties of ZnO Codoped with Co and Cd

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