HALL-EFFECT AND MAGNETORESISTANCE IN CO-BASED AMORPHOUS AND CRYSTALLIZED ALLOYS

We have analyzed the crystallization effects on the Hall resistivity a nd magnetoresistance in two different sets of Go-based amorphous glass es having a similar composition and commercially known as Metglas and Vitrovac. The behaviours of the Hall constants R-o and R-S show that t he mobility mu of the conduction electrons of the crystallized phase i s improved in comparison with that of the amorphous phase and at the s ame time the scattering effects are reduced. Moreover, the ferromagnet ic anisotropic resistivity (FAR) increases with the Co percent content and decreases with resistivity while this does not occur in crystalli zed samples. In the latter, the longitudinal and transverse variations of resistivity with applied magnetic held are equivalent, but the val ues of the FAR are much higher than those of the amorphous state. The behaviour of the nanostructured samples is quite similar to that of th e amorphous state.