HALL-EFFECT AND RESISTIVITY IN Y-3D (FE, NI) BASED AMORPHOUS FILMS

We have studied the magnetic behavior of amorphous Y-3d based systems, using resistivity and Hall effect measurements. YxNi1-x metallic glasses show a very different magnetic behavior from Fe glasses, with a cross over (x = 0.22) from weak itinerant ferromagnetism to paramagnetism. Two more magnetic metallic glasses have been studied, a typical ferromagnetic system Fe-Si-Y (with Fe content only 52%) and a noncollinear ferrimagnetic (sperimagnetic) system (Fe-Si-Tb). In spite of their very different magnetic mechanisms the resistivities all show low temperature minima with logarithmic dependence below the minima temperatures. This behavior is not magnetic field dependent, with applied fields up to 70 kOe. We show Hall effect measurements that easily distinguish the different intrinsic mechanisms.