Magnetic and magneto-optical properties of ion-synthesized cobalt nanoparticles in silicon oxide

The magnetic and magneto-optical properties of ion-synthesized cobalt nanoparticles in the amorphous silicon oxide matrix are investigated as a function of the implantation dose. The analysis of the field dependences of the magnetization and the magneto-optical Faraday and Kerr effects demonstrates...

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Bibliographic Details
Published in:	Physics of the solid state Vol. 50; no. 11; pp. 2088 - 2094
Main Authors:	Edelman, I. S., Vorotynova, O. V., Seredkin, V. A., Zabluda, V. N., Ivantsov, R. D., Gatiyatova, Yu. I., Valeev, V. F., Khaĭbullin, R. I., Stepanov, A. L.
Format:	Journal Article
Language:	English
Published:	Dordrecht SP MAIK Nauka/Interperiodica 01-11-2008
Subjects:	Magnetism and Ferroelectricity Physics Physics and Astronomy Solid State Physics 75.60.Ej 78.20.Ls 61.46.Df
Online Access:	Get full text
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Summary:	The magnetic and magneto-optical properties of ion-synthesized cobalt nanoparticles in the amorphous silicon oxide matrix are investigated as a function of the implantation dose. The analysis of the field dependences of the magnetization and the magneto-optical Faraday and Kerr effects demonstrates that, as the ion implantation dose increases, the superparamagnetic behavior of an ensemble of cobalt nanoparticles at room temperature gives way to a ferromagnetic response with the anisotropy characteristic of a thin magnetic film. The magnetization curves for the superparamagnetic and ferromagnetic ensembles of cobalt nanoparticles are simulated to determine their average sizes and the filling density in the irradiated layer of the silicon dioxide matrix. It is revealed that the spectral dependences of the Faraday and Kerr effects for ion-synthesized cobalt nanoparticles differ substantially from those for continuous cobalt films due to the localized excitations of free electrons in the nanoparticles.
ISSN:	1063-7834 1090-6460
DOI:	10.1134/S1063783408110140