Coercivity of homogenized ensembles of anisotropic γ-Fe2O3 nanoparticles
А. Б. Кулаков, И. П. Лаврентьев, В. И. Петинов · Technical Physics · 2011
The influence of interaction between anisotropic γ-Fe2O3 nanoparticles on their coercive force H c is studied. In samples where the degree of homogenization of anisotropic γ-Fe2O3 nanoparticles is high owing to mechanical, ultrasonic, and magnetic dispersion with subsequent filtering of resulting suspensions, H c is almost independent of volume concentration η of the particles when η varies between 4 × 10−4 and 10−1. In samples homogenized only mechanically, the H c versus logη dependence is linear.