CONTRASTING BEHAVIOR OF FREE-STANDING AND EMBEDDED MAGNETIC NANOPARTICLES

By developing a recently proposed microscopic theoretical approach to the study of magnetic nanoparticles a possibility of contrasting temperature dependence is predicted for the free-standing and embedded samples. The theory also explains the paradox when a standard bulk dependence of magnetization is observed in nanoparticles. The interplay of surface and shape effects is shown to be important for controlling the properties of nanomagnets.