FMR study of agglomerated nanoparticles in a Fe3C/C system

• Autorzy: Guskos N. , Typek J. , Maryniak M. , Narkiewicz U. , Kucharewicz I. , Wróbel R.
• Konferencja: Workshop on Functional Materials FMA 2004, Athens, Greece, 23-26 September 2005
• Języki publikacji: EN

Abstrakty

EN

Three samples with various Fe3C/C ratios have been prepared by the carburisation of iron with ethylene or an ethylene-hydrogen mixture. Carburisation was controlled with thermogravimetry. After carburisation, the samples were characterized using XRD and scanning electron microscopy. XRD measurements have shown the presence of the Fe3C (cementite) phase only. The mean size of cementite crystallites estimated using Scherrer's equation was in the range of 40-46 nm. Ferromagnetic resonance (FMR) absorption signals were investigated at room temperature. In all samples an asymmetric, very broad, and intense FMR line shifted toward low magnetic field was recorded. The linewidth, intensity, and position of the resonance field depended strongly on carbon concentration. With increasing carbon concentration the linewidth and integrated intensities of the FMR spectra decreased, and the resonance line shifted towards higher magnetic fields. The separation of granules from each other by carbon could drastically influence the FMR absorption spectrum due to decreasing intergranular interaction with increasing carbon concentration.

Słowa kluczowe

EN

magnetic resonance; nanoparticle; cementite

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2005
• Tom: Vol. 23, No. 4
• Strony: 1001--1008
• Opis fizyczny: Bibliogr. 21 poz., rys., tab.

Twórcy

autor

Guskos N.

autor

Typek J.

autor

Maryniak M.

autor

Narkiewicz U.

autor

Kucharewicz I.

autor

Wróbel R.

• Solid State Section, Department of Physics, University of Athens, Panepistimioupoli, 15 784 Zagrafou, Athens, Greece,

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