Title :
Structural, magnetic and magnetotransport properties of melt-spun Fe10Cu90
Author :
Rossler, U.K. ; Idzikowski, Bogdan ; Eckert, D. ; Nenkov, Konstantin ; Muller, K.-H.
Author_Institution :
Inst. fur Festkorper- und Werkstofforschung Dresden
fDate :
9/1/1999 12:00:00 AM
Abstract :
Melt-spun Fe10Cu90 shows a negative magnetoresistance with a nearly linear dependence on external field. The microstructure has Fe-atoms on fcc-sites, corresponding to C_u_Fe solid solution, and in bcc α-Fe precipitates. Magnetic data indicate the presence of magnetic couplings between magnetic clusters. It is argued that both microstructures corresponding to the two locations of Fe, yield a mechanism for magnetoresistance. The resistivity in zero field shows a minimum at a temperature above the magnetic freezing or ordering temperature determined as the peak of ac-susceptibility. Glassy dynamics is seen from a creep of the resistivity after cooling below the freezing temperature. A simple micromagnetic model is applied to describe the increase of magnetoresistance with the amount of precipitated α-Fe
Keywords :
copper alloys; crystal microstructure; crystal structure; giant magnetoresistance; iron alloys; magnetic particles; magnetic susceptibility; precipitation; spin glasses; Fe10Cu90; ac-susceptibility; bcc α-Fe precipitates; fcc-sites; glassy dynamics; linear dependence; magnetic clusters; magnetic coupling; magnetic freezing; magnetic properties; magnetotransport properties; melt-spun Fe10Cu90; micromagnetic model; microstructure; negative magnetoresistance; precipitated α-Fe; resistivity; solid solution; structural properties; Conductivity; Cooling; Couplings; Creep; Iron; Magnetic properties; Magnetoresistance; Microstructure; Solids; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
