THE PUBLISHING HOUSE PROCEEDINGS OF THE ROMANIAN ACADEMY, Series A OF THE ROMANIAN ACADEMY Volume 8, Number 1/2007, pp.000-000 THE INFLUENCE OF THE EFFECTIVE ANISOTROPY CONSTANT ON THE RELAXATION PROCESS IN INTERAC

The most challenging problem in physics of disordered systems of magnetic nanoparticles is the investigation of their dynamical properties. The major difficulty here is due to the long – range and dipolar inter particle interaction. Some experimental and theoretical researches of last period on the relation between the dipolar magnetic interaction strength and the relaxing time give inconsistent results. This study introduces a feigning parameter for the effective anisotropy constant.Thus, a description of the influence of the parameter on the energy barrier distribution density in interacting magnetic nanoparticle systems, is given as a possible interpretation of the mentioned inconsistent results. Key words:Relaxation process; Nanoparticles; Dipolar interaction; Simulation. 1