Structural and Magnetic Properties of Zn_1-xNi_xO Nanoparticles Synthesized by a Wet Chemical Method

Abstract:

Wurtzite type Zn_1-xNi_xO (x=0-0.10) nanoparticles were synthesized by a chemical method via an amorphous polymer precursor. The precursors were derived by a novel process involving a reaction between aqueous solutions of metal ions (Zn²⁺and Ni²⁺) and a freshly prepared solution of poly-vinyl alcohol (PVA)-sucrose under constant stirring at 60-65°C. Structural and magnetic properties of the recrystallized Ni-doped ZnO nanoparticles, obtained after heat treating the corresponding precursors at selected temperatures, were studied in detail. X-ray diffraction (XRD) reveals an increment in the lattice parameters and lattice volume in the doped ZnO samples, confirming the incorporation of Ni²⁺ ions in the ZnO host lattice. All doped samples showed room-temperature ferromagnetism (RTFM) with an increasing saturation magnetization with the increase in Ni doping in the otherwise non-magnetic ZnO. The studies reveals that the observed ferromagnetism is purely intrinsic in nature and it occurs due to the hybridized p-d exchange interaction between magnetic polarons via vacancy mediated defect states inside the crystal lattice.

• Periodical: Applied Mechanics and Materials (Volumes 446-447)
• Pages: 137-141
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.446-447.137
• Online since: November 2013
• Authors: Jeevan Jadhav, Somanth Biswas*
• Keywords: Chemical Synthesis, Diluted Magnetic Semiconductors, Ferromagnetism, Ni-Doped Zno

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