HALL-EFFECT IN MNTE FILMS

The Hall effect is reported for MnTe films of different compositions a nd thicknesses in the range 25-150 nm. Both R(o) and R(s) exhibit a pr onounced size effect. R(o) remains negative for the entire thickness r ange studied, while the sign of R(s) depends on the substrate temperat ure and the tellurium content in the films. The extraordinary Hall coe fficient is found to be proportional to the square of the total film r esistivity, which suggests that the asymmetric scattering process is p redominant at room temperature.