Enhancement of room temperature ferromagnetism in Cd1−xNixSe nanoparticles
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Cd1−xNixSe (x = 0.0, 0.02, 0.05 and 0.1) nanoparticles have been synthesized by chemical route. X-ray diffraction analysis shows crystalline nature of synthesized nanoparticles possessing wurtzite phase having hexagonal structure. Transmission electron microscopy depicts spherical morphology and uniform particle size distribution of pure and Ni-doped CdSe nanoparticles. The blue-shift in band gap has been observed with Ni-doping concentration. Photoluminescence study shows the presence of intrinsic defects (VCd–VSe) in the synthesized nanoparticles. Electron spin resonance (ESR) analysis reveals the long range ferromagnetic ordering in pure and doped nanoparticles. ESR study also indicates that Ni ions exist in +2 oxidation state in host nanoparticles. The magnetic hysteresis (M-H) loops display ferromagnetism at room temperature in pure and Ni-doped CdSe nanoparticles. The increase of ferromagnetic behavior has been observed with Ni-doping concentration. M-H analyses indicate that defects and carrier mediated exchange interactions are responsible for ferromagnetic ordering, in the present study.
KeywordsElectron Spin Resonance Magnetic Hysteresis Intrinsic Defect Ferromagnetic Resonance Electron Spin Resonance Study
The authors gratefully acknowledge Defense Research and Development Organization (DRDO), India for granting financial support (vide sanction letter no. ERIP/ER/0903766/M/01/1191) to carry out this research work. One of the authors, Jaspal Singh, gratefully acknowledges Thapar University, Patiala, India for providing Teaching Associateship.
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