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Magnetic Properties of Carbon-Coated Ni Nanoparticles Prepared by Solid-Phase Pyrolysis of Nickel-Phthalocyanine

Aram Manukyan

Laboratory of Solid State Physics, Institute for Physical Research of NAS of Armenia, Gitavan-2, Ashtarak 0203, Armenia

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Armen Mirzakhanyan

Laboratory of Solid State Physics, Institute for Physical Research of NAS of Armenia, Gitavan-2, Ashtarak 0203, Armenia

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Laszlo Sajti

Department of Nanotechnology, Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany

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Ruben Khachaturyan

Laboratory of Solid State Physics, Institute for Physical Research of NAS of Armenia, Gitavan-2, Ashtarak 0203, Armenia

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Egor Kaniukov

Division of Cryogenic Research, Scientific-Practical Materials Research Centre, NAS of Belarus, 19 P. BrovkaStr, Minsk BY-220072, Belarus

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Leonid Lobanovsky

Division of Cryogenic Research, Scientific-Practical Materials Research Centre, NAS of Belarus, 19 P. BrovkaStr, Minsk BY-220072, Belarus

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, and

Eduard Sharoyan

Laboratory of Solid State Physics, Institute for Physical Research of NAS of Armenia, Gitavan-2, Ashtarak 0203, Armenia

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https://doi.org/10.1142/S1793292015500897Cited by:13 (Source: Crossref)

Abstract

Carbon-coated nickel nanoparticles with a mean diameter of 40nm were synthesized via solid-phase pyrolysis of nickel-phthalocyanine. The composition structure and morphology of samples were investigated by scanning and transmission electron microscopy, X-ray diffraction, Raman spectroscopy and energy-dispersive X-ray microanalysis. Magnetic characteristics of samples were measured with a vibrational magnetometer and a magnetic resonance spectrometer. The main mass of Ni ferromagnetic nanoparticles have a single-domain and a vortex (pseudo-single domain) structures. We also revealed superparamagnetic Ni nanoparticles (several percent) and carbon paramagnetic centers caused by defects in the carbon matrix. We determined the main magnetic characteristics of Ni nanoparticles, their temperature and field dependences as well as the parameters of ferromagnetic resonance spectra.

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