Abstract
The aim of this paper is to investigate a new type of magnetic material, which has a permanent random exchange interaction. The ferromagnetic properties (magnetizations) of an Ising nanostructure are investigated using the effective field theory with correlations. The system has consisted from spin-1/2 atoms with a random exchange interaction J<sub>ij</sub>. The value of J<sub>ij</sub> is randomly distributed by a random function. A specific investigation about the special effects of the random core exchange interaction on the magnetization and the critical temperature has been studied. For the appropriate value of the system parameter new descriptions and phenomena of the magnetizations in 3D have been obtained. The results show that it is possible to get the same ferromagnetic behavior observed with a constant exchange interaction by using a permanent random exchange interaction. Moreover, the results found can be as well displayed in three dimensions (3D) with the same behavior observed in 2D. The results are well detailed in the paper.
Highlights
During the last years, magnetic nanoparticles systems [1,2,3,4,5,6] have attracted considerable attention of researchers due to their several applications in the new technologies [7,8,9,10,11,12,13,14]
Some numerous experimental techniques have been reported to get nanoscales magnetic materials [16,17,18,19] and theoretically, the magnetic properties of these nanoparticles have mainly been examined by using the mean-field theory (MFA), the effective-field theory (EFT), and the Monte Carlo simulation (MC) [20,21,22,23,24,25,26,27,28,29]
The aim in this paper is to investigate the ferromagnetic properties by the EFT within the probability distribution technique that accounts for the self-spin correlations by using the random exchange interaction
Summary
Magnetic nanoparticles systems [1,2,3,4,5,6] have attracted considerable attention of researchers due to their several applications in the new technologies [7,8,9,10,11,12,13,14]. When the dimension of the magnetic nanoparticles decreases to the nanometer scale, the surface to volume ratio increases. Because of this process, these nanoparticles start to exhibit new phenomenon and interesting physical properties which are totally different from those observed in the bulk materials [15]. Just a few groups of scientists used the influence of the random exchange interaction to investigate some magnetic properties such as M. The aim in this paper is to investigate the ferromagnetic properties (magnetizations) by the EFT within the probability distribution technique that accounts for the self-spin correlations by using the random exchange interaction. One presents a new method to observe the ferromagnetic magnetizations in three dimensions
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