The Influence of Thickness on the Magnetic Properties of Nanocrystalline Thin Films: A Computational Approach

A study of the magnetic behaviour polycrystalline thin films as a function their thickness is presented in this work. The grain volume was kept approximately constant virtual samples. model includes exchange interaction, magneto-crystalline anisotropy, surface boundary dipolar and Zeeman effect. thickness-dependence critical temperature, blocking irreversibility temperature are presented. Surface anisotropy exerts great influence at very low thicknesses, producing monodomain regime. As increases, interaction produces coupling in-plane single domains per which favours superparamagnetic states. At higher effects produced by decrease dramatically. result, states present three-dimensional local anisotropies grain.