No abstract

No abstract

No abstract

No abstract

teresis loop compared to that observed for particles in powder form.In this communication, synthesis of 10.7 nm ferrite nanocrystals doped with 3.5 % in mass of cobalt ions is described. Organization of nanoparticles is controlled by the method of deposition on a substrate. In an applied magnetic field, deposition leads to formation of well-aligned nanoparticles on a very large scale forming a flat surface. In the absence of an applied field, the particles self-arrange on the substrate by forming large spheres with a large coverage. Magnetic properties of nanocrystals differing by their organizations are presented: when particles are aligned, the hysteresis loop is straightened and the magnetic parameters such as remanence and coercivity notably increase. These changes in the magnetic properties are related to the demagnetizing factor and to the orientation of the magnetic moments of the particles along one of the easy magnetization axes.