LAUSR

The magnetic characteristics of ensembles of La0.6Sm0.1Sr0.3MnO3 nanoparticles measured at different temperatures are analyzed quantitatively. The field and temperature dependences of the magnetization of the ensemble are calculated on the basis of this analysis. The calculations indicate that the spread in the parameters of the nanoparticles has a decisive influence on the key magnetic parameters of the ensemble: coercitive force, residual magnetization, and blocking temperature. It is shown that complete agreement between the experimental and calculated dependences is possible only if it is assumed that two different regions contribute to the total magnetic signal: anisotropic strong magnetic and isotropic weak magnetic regions. The effect of temperature on the behavior of the two types of regions is determined. It is concluded that the analytic procedure proposed here can be used to characterize the properties of other systems of magnetic nanoparticles, and can also be extended to the analysis and pred...