Magnetization of nickel small particles

摘要

Investigation of magnetic properties of small ferromagnetic particles is an actual problem in connection with wide possibilities of their practical application (see, for instance). Among those objects there is particular interest in nanoparticles, i.e., particles with characteristic sizes are 10÷50A, consisting of a finite number of atoms which spatial configurations form structures of the certain types. Numerous experiments and numerical calculations show that the following types of spatial structures of ferromagnetic nanoparticles are most frequent: fcc, bcc and icosahedral particles with the axis of five-fold symmetry forbidden by the translation symmetry for bulk. It is clear that magnetic properties of ferromagnetic nanoparticles depend on types of their spatial structures and collective interaction effects. Apparently, if the distance between the particles is large enough, we can neglect the interaction effects and consider an individual nanoparticle. In the present work, the influence of nanopartical atomic spatial structure on the peculiarities of magnetic properties of Ni nanopartical we investigate.