Monte Carlo simulations of the magnetocaloric effect in superferromagnetic clusters having uniaxial magnetic anisotropy

摘要: The magnetic entropy change, ΔS (hence the heating or cooling) of ferromagnetically coupled clusters induced by an application a field is substantial and occurs over broad temperature range. This behavior contrasts with ferromagnetic material, where larger changes can be obtained, but only small ranges close to Curie point. Monte Carlo simulations have been carried out obtain when spins are subjected uniaxial anisotropy fields. While previous calculations for interacting showed increases in enhancements vicinity point increasing anisotropy, present results show similar peaks accompanied decreases peak values ΔS. These that flattening peaks, which make superferromagnetic materials valuable refrigeration assisted presence anisotropy. Some effe...