DOMAIN-WALLS DYNAMICS AND SEPARATION OF MAGNETIZATION PROCESSES IN INPLANE 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 anis otropy. The influence of the amplitude and frequency of the exciting f ield on the two magnetization processes, domain wall motion and spin r otation, is studied, showing the existence of a critical field for dom ain wall depinning and a domain wall relaxation. We show that it is po ssible to separate and evaluate the contribution of the two magnetizat ion processes to the permeability and analyse the influence of the ani sotropy dispersion on the frequency spectra of the permeability.