ELECTRICAL-TRANSPORT IN AMORPHOUS FE-MN-ZR ALLOYS

The magnetic and electrical transport properties of amorphous Fe-Zr ba sed alloys with compositions near 10 at. % Zr with various elements su bstituted for Fe are of particular interest. In the case of Mn substit utions the Curie temperature and the average magnetic moment decrease monotonically with increasing Mn content and the temperature dependenc e of the magnetization is significantly modified. The electrical trans port properties of amorphous Fe90-xMnxZr10 (for x=0, 4, 8, and 12) ove r the temperature range of 4.2-300 K and the magnetoresistance for fie lds up to 4.0 T at 4.2 K are reported in the present work. Abroad mini mum in the resistivity is observed at around 255, 235, 200, and 180 K for the four compositions, respectively. In the case of the x=8 sample a second minimum occurs at around 50 K. The magnetoresistance of all samples shows a sharp increase for small fields and a linear field rel ationship for fields above about 0.1 T.