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Researcher: Shaveta Thakur
Guide(s): Sanjay Kumar
University: Arni University
Completed Date: 28/02/2018
Abstract: Dilute Magnetic Semiconductor is able to offer the possibility of studying magnetic phenomena in crystals with a simple band structure and excellent magneto-optical and transport properties. It also gives rise to the possibilities for many sensing and switching applications in high-speed and high-density memory, quantum interface devices and magneto-optical devices. ZnO a direct band gap semiconductor with the band gap of 3.37eV that is suitable for short wavelength optoelectronic applications and high exciton binding energy of 60 meV. Transition metal doped ZnO based DMS materials are the most promising candidates for spintronics applications. In this present work, we report chemical precipitation method to prepare Zn1-x-yNixAgyO (0.01and#8804; x,y and#8805; 0.05) and Zn1-x-yNixCuyO (0.01and#8804; x,y and#8805; 0.05) nanoparticles. The different behavior of doped ZnO can be explained on the basis of different chemical nature and different ionic radii of dopant cation as compared to the host cation. We have checked the possibility of these materials for DMS applications by characterizing these samples with X-Ray Diffraction, Scanning Electron Microscopy, Fourier Transform Infrared Spectroscopy, UV-Visible spectroscopy and Photoluminescence spectroscopy, VSM and impedance spectroscopy. In this proposal, work is mainly focussed on the study of co-doped nanomaterials. XRD studies reveal hexagonal wurtzite structure. The average crystallite size is found to decrease for first series and vice versa for second series. The SEM results are in agreement with XRD data. All stretching and vibrational bands are observed at their specific positions through FTIR. The decrease in band gap in first series and increase in band gap in second series is attributed to the different chemical nature of dopant and host cation. The variation of conductivity with temperature obeys Arrhenius relation. Very low coercively and remanence prove that the particles are super paramagnetic and also show room temperature ferromagnetism. newline
Pagination: 4.81 MB
Appears in Departments:Department of Physics

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