Abstract
Hysteresis loops obtained in soft amorphous Co-Zr thin films of toroidal shape at room temperature, for very low and high AC exciting fields are shown and commented. Initial susceptibility is deduced from the Rayleigh loops. The influence of biasing fields in different directions were also studied. For a biasing field applied parallel to the AC field, the parallel reversible permeability μ r| was measured versus the biasing fields. For in-plane and perpendicular biasing fields, constricted loops appear. The results are analysed and the predominance of Bloch walls motions in magnetization processes can be concluded.
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