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Advances in Condensed Matter Physics
Volume 2015, Article ID 854625, 4 pages
http://dx.doi.org/10.1155/2015/854625
Research Article

Quadrupole Excitations in Magnetic Susceptibility of Magnetic Nanoparticle Fe8

Department of Physics, Payame Noor University, Tehran, Iran

Received 24 September 2014; Revised 26 February 2015; Accepted 27 February 2015

Academic Editor: Veer P. S. Awana

Copyright © 2015 Yousef Yousefi. 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

Magnetic susceptibility dependence on temperatures in different magnetic fields will be discussed. Until today, to calculate magnetization and magnetic susceptibility, only dipole excitations have been considered, but, due to the symmetry of operators in Hamiltonian and also to achieve more accuracy, other multiple excitations must be taken into account too. To this end, here, both dipole and quadruple excitations are considered and then the resulting curves will be plotted in presence of different magnetic fields. Finally, seen that the graphs obtained using the multipole excitations more accurately with results taken by experimental data.