Nanoparticles of cobalt ferrite: Influence of the applied field on the organization of the nanocrystals on a substrate and on their magnetic properties

The effects of the applied field on the magnetic properties of ferrite nanoparticles doped with 3.5% in mass of cobalt ions were investigated. In the presence of an applied magnetic field, deposition led to the formation of well-aligned nanoparticles on a very large scale forming a flat surface. In the absence of an applied field, the particles self-arranged on the substrate by forming large spheres with a large coverage. The alignment of the particles straightened the hysteresis loop, and the magnetic parameters such as remanence and coercivity notably increased.