Precessional frequency of ferromagnetic elements: Influence of magnetic domain width

A model is presented that semi-quantitatively describes the dependence of precessional frequency on magnetic domain width in ferromagnetic thin film elements. With decreasing domain width an increase of precessional frequency at zero-bias field by a factor of about 1.5 is found experimentally and from the calculations. The modelled value of change of precessional frequency is in agreement with the experimental results. The simple model offers the opportunity to relate the drastic effects of domain structure on the dynamic magnetic properties of soft-magnetic thin films by a straightforward approach.