Domain walls dynamics and separation of magnetization processes in in-plane anisotropic amorphous ferromagnetic thin films

Permeability due to domain wall motion and spin rotation is studied on CoZr and CoZrRe thin films presenting different distributions of anisotropy. The influence of the amplitude and frequency of the exciting field on the two magnetization processes, domain wall motion and spin rotation, is studied, showing the existence of a critical field for domain wall depinning and a domain wall relaxation. We show that it is possible to separate and evaluate the contribution of the two magnetization processes to the permeability and analyse the influence of the anisotropy dispersion on the frequency spectra of the permeability.