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Structural, magnetic and magnetotransport properties of melt-spun Fe10Cu90

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5 Author(s)
Rossler, U.K. ; Inst. fur Festkorper- und Werkstofforschung Dresden ; Idzikowski, B. ; Eckert, D. ; Nenkov, K.
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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

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Magnetics, IEEE Transactions on  (Volume:35 ,  Issue: 5 )