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Magnetoresistance studies of melt-spun amorphous Fe/sub 1-x/Zr/sub x/ ferromagnets.
D. Dahlberg, K. V. Rao, K. Fukamichi
J. Appl. Phys. 55 p. 1942 (1984).
Abstract: A remarkable feature in amorphous Fe/sub 1-x/Zr/sub x/ alloys is that for Fe concentrations greater than 90 at.%, the ferromagnetic transition temperature T/sub c/ decreases with increasing Fe concentration. In addition, alloys containing 93-90 at.% Fe are found to show a spin-glass-like behavior at low temperatures, i.e. below T/sub c/. The electrical resistivity of these alloys shows a minimum at roughly the Curie temperature. The authors have measured the transverse magnetoresistance of Fe/sub 91/Zr/sub 9/, and Fe/sub 90/Zr/sub 10/ alloys from 4 to 300K in applied magnetic fields as large as 9 T. They find that (1) the field derivative of the magnetoresistance is positive at all temperatures in applied fields larger than 0.1 T; (2) a maximum occurs in the magnetoresistance at roughly the Curie temperature; (3) below the Curie temperature a small negative low-field magnetoresistance develops which increases with decreasing temperature. These results indicate that the resistance minimum which occurs around the Curie temperature for these alloys is due to the coherent exchange scattering by the Fe moments, and is not associated with a Kondo mechanism as previously proposed. (14 References).
last modified:
10.Jun.2002
by Thomas Gredig