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 2008-11, Vol.50 (11), p.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: Article
Language:English
Subjects:
Magnetism and Ferroelectricity
Physics
Physics and Astronomy
Solid State Physics
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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