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Journal of Nanomaterials
Volume 2009 (2009), Article ID 308276, 7 pages
http://dx.doi.org/10.1155/2009/308276
Research Article

Magnetic Properties of ( )

1Institute of Theoretical Physics and Astronomy, Vilnius University, Gostauto 12, 01108 Vilnius, Lithuania
2Liquid Crystal Laboratory, Vilnius Pedagogical University, Studentu 39, 08016 Vilnius, Lithuania
3Nanophotonics Laboratory, The Institute of Photonic Sciences, Av. del Canal Ol.mpic s/n, 08860 Castelldefels, Spain
4Physic Faculty, Vilnius University, Sauletekio al. 9, 10222 Vilnius, Lithuania

Received 27 May 2009; Revised 1 September 2009; Accepted 22 September 2009

Academic Editor: Christian Brosseau

Copyright © 2009 Jelena Tamulienė et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We present quantum chemical investigations on magnetic properties of several ( ) nanoparticles. The results of calculations show, that only , and particles display paramagnetic properties while other nanoparticles investigated reveal diamagnetic ones. The reason of the derivative paramagnetizability is discussed here. Calculations reveal that the stability of these compounds increases with the increase of the number of O atoms. The limit when the future increase of oxygen atoms does not change binding energy per atoms remarkably is found. The reason why the O atoms could stabilize the Co nanoparticles and change magnetic properties of them is discussed.