Abstract

We characterize the magnetic blocking in a two dimensional sample (2D) containing nanometer size magnets with, in plane, random distribution of uniaxial anisotropy axis. We show Zero Field Cooled (ZFC) and Field Cooled (FC) curves for different size distributions. The effect of the random distribution of anisotropy axis is to determine the minimum width of the ZFC curve. The asymmetry of the size distribution also contributes to the broadening of the ZFC curve and to the shift of blocking temperature (T B).