J. Phys. IV France
Volume 08, Numéro PR2, June 1998
Soft Magnetic Materials 13
Page(s) Pr2-635 - Pr2-638
Soft Magnetic Materials 13

J. Phys. IV France 08 (1998) Pr2-635-Pr2-638

DOI: 10.1051/jp4:19982147

Hysteresis modeling and microstructural analysis of soft amorphous alloys

M. Pasquale, F. Offi, A. Infortuna, E. Ferrara, C. Beatrice, C. Appino and G. Bertotti

Istituto Elettrotecnico Nazionale Galileo Ferraris, Corso M. d'Azeglio 42, 10125 Torino, Italy

The dynamic Preisach model is applied to the study of Fe-based and Co-based amorphous alloys, characterized by different microstructural conditions. It is shown that all static and dynamic hysteresis properties are correctly predicted by the dynamic Preisach model by associating with each material a structural parameter, λ, which represents the linear dimension of the correlation regions providing coherent magnetization changes. The dependence of this correlation length on annealing treatments is compared with Kerr-effect domain observations and structural data obtained by differential scanning calorimetry. It is found that λ has a role comparable to that of grain size in micro-crystalline alloys. In particular, it is shown that the linear relation holds, HC=Hc0 + c/λ, between the static coercive field Hc and 1/λ, where the slope c depends on the magnetostriction constant of the material and the amount of quenched-in stresses, while the offset Hc0 is connected to surface characteristics.

© EDP Sciences 1998