HALL RESISTIVITY OF A 2-PHASE MAGNETIC MATERIAL - CRYSTALLIZED METGLAS-2826

Hall resistivity measurements in the temperature range 100-800K have been used to study the influence of thermal cycling and annealing on amorphous Fe40Ni40P14B6. While the as-received sample has Tc=510K, thermal cycling to 700K yields a two-phase system, one of the phases have a broad transition around 425K. Annealing for three hours at 800K causes this transition to sharpen up, and a second transition at 730K is also observed. The extraordinary Hall coefficient (R 1) has been analysed and is described in terms of linear contributions from each phase. From simultaneous measurements of the ohmic resistivity rho on the same sample it is found that, for the two-phase material, R1 is related to rho as R1=a rho +b rho 2 for 100<T<300K. In the amorphous state there is an anomaly in rho at T c. From the relationship between R1(T) and rho (T) it is concluded that in both amorphous and crystallised materials the side jump is of the same order of magnitude as in dilute Fe alloys.