Modeling of the directional dependence of the hysteresis in nanostructured thin films by ion irradiation

An energetic hysteresis model is applied to the prediction of the directional dependence of the hysteresis in thin film nanostructures, using the inner demagnetizing factor and the anisotropy dependence of the model parameters. The elongated ferromagnetic nanoparticles have been formed by heavy ion irradiation of paramagnetic YCo2 thin films, thus affecting both anisotropy and spontaneous magnetization.