HALL-EFFECT AND MAGNETORESISTANCE IN RAPIDLY QUENCHED FE-B RIBBONS

The Hall effect and transverse magnetoresistance (MR) in amorphous fer romagnetic alloys Fe100-xBx with x=12.2-18.1 at% have been studied at 77-300 K. It was found that the ordinary and extraordinary Hall coeffi cients, R(o) and R(s), are equal to R(o)=(20-70)x10(-12) Wcm G(-1) and R(s)=(6-9)x10(-10) Wcm G(-1), depend on temperature (dR(o)/dT <0, dR( s)/dT <0) and display a non-monotonic dependence on composition, with extrema at x=14.4 at%. It was established that for amorphous and cryst alline alloys the typical relation between R(s) and the resistivity is not fulfilled in amorphous alloys Fe-B. In the case of a magnetic fie ld perpendicular to the ribbon plane, the transverse MR is positive up to 8-10 kOe. The most pronounced positive effect exists in alloys wit h 13.1 at% at similar to 180 K. Possible reasons for the unusual behav iour of R(s) and the MR are discussed.