Abstract
The static or thermal equilibrium properties of non-interacting magnetically anisotropicnanoparticles are studied in the framework of classical theory. Various important thermalequilibrium properties, e.g. internal energy, specific heat, magnetization and susceptibility,are derived from basic thermodynamic functions such as the partition function andthermodynamic potentials. The central issue in this paper is to study the effect ofanisotropic potential on these thermal equilibrium properties. We extensively study thelinear and nonlinear susceptibilities and their temperature dependence. We also give acomparative study of the magnetic properties of a superparamagnetic fine particle systemand a canonical spin-glass system and thus invoke the similarities and differences betweenthe two.
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