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Magnetic resonance study of carbon encapsulated Ni nanoparticles

100%

Bobrowska M., Typek J., Zolnierkiewicz G., Wardal K., Guskos N., Pelech I., Podsiadly M., Narkiewicz U.

Open Chemistry

2012

vol. 10

issue 6

1963-1968

Magnetic resonance study of six samples consisting of carbon encapsulated nickel nanoparticles or carbon nanotubes ended with such nickel nanoparticles was carried out at room temperature. Samples of Ni/C were prepared by carburization of nanocrystalline nickel by ethylene (C2H4) and methane (CH4). Hydrocarbons decomposition on nickel nanoparticles was done at temperatures 500, 600 and 700°C. Magnetic resonance spectra of samples designated as CH4/500, CH4/600, CH4/700, C2H4/500, C2H4/600 and C2H4/700 were obtained by Bruker E 500 spectrometer. The integrated intensities of the resonance spectra were correlated with the carburization conditions (temperature, type of hydrocarbon) during samples preparation. A core-shell model of the investigated samples allowed rough estimation of appropriate shell sizes. [...]

Magnetic properties of ZnFe2O4 nanoparticles

81%

Guskos N., Glenis S., Typek J., Zolnierkiewicz G., Berczynski P., Wardal K., Guskos A., Sibera D., Moszyński D., Lojkowski W., Narkiewicz U.

Open Physics

2012

vol. 10

issue 2

470-477

Fine particles of ZnFe2O4 were synthesized by a wet chemical method in the (80 wt.% Fe2O3 + 20 wt.% ZnO) system. The morphological and structural properties of the mixed system were investigated by scanning electron microscopy, X-ray diffraction, inductively coupled plasma atomic emission, and X-ray photoelectron spectroscopy. The major phase was determined to be the ZnFe2O4 spinel with particle size of 11 nm. The magnetic properties of the material were investigated by ferromagnetic resonance (FMR) in the temperature range from liquid helium to room temperature. A very intense, asymmetric FMR signal from ZnFe2O4 nanoparticles was recorded, which has been analyzed in terms of two Callen-lineshape lines. Temperature dependence of the FMR parameters was obtained from fitting the experimental lines with two component lines. Analysis of the FMR spectra in terms of two separate components indicates the presence of strongly anisotropic magnetic interactions.

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1 Open Chemistry

1 Open Physics

2 2012

2 Guskos N.

2 Narkiewicz U.

2 Typek J.

2 Wardal K.

2 Zolnierkiewicz G.

1 Berczynski P.

1 Bobrowska M.

1 Glenis S.

1 Guskos A.

1 Lojkowski W.

1 Moszyński D.

1 Pelech I.

1 Podsiadly M.

1 Sibera D.

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Magnetic resonance study of carbon encapsulated Ni nanoparticles

Magnetic properties of ZnFe2O4 nanoparticles