Magnetoresistance of amorphous (FexNi100-x)80B10P10 alloys in magnetic fields up to 14.5 T

The influence of the Fe content x (2 ≦ x ≦ 50) and of applied magnetic field up to 14.5 T on the electrical resistivity of amorphous (Fex,Ni100−x)80B10P10 alloys is investigated. The samples with x ≧ 22 show a negative magnetoresistance (MR) increasing steadily up to 14.5 T. The maximum MR corresponds to x = 10. The temperature of the resistivity minimum Tmin and the coefficient a of the logarithmic resistivity term at T < Tmin are strongly influenced by the Fe content and the applied magnetic field. Above 10 T, the coefficient a is constant and Tmin changes only little. MR is proportional to the square of magnetization σ. By comparison of these results with known theories the assumption of the magnetic origin of the resistivity minimum may be supported. Es wird der Einflus des Fe-Gehaltes x (2 ≧ x ≥ 50) und von Magnetfeldern bis 14,5 T auf den elektrischen Widerstand von amorphen (Fex,Ni100−x)80B10P10-Legierungen untersucht. Die Proben mit x ≧ 22 zeigen einen negativen Magnetowiderstand (MR), der bis 14,5 T stetig anwachst. Die Legierung x = 10 besitzt den grosten Magnetowiderstand. Die Temperatur des Widerstandsmini-mums Tmin und der Koeffizient a des logarithmischen Widerstandsterms bei T < Tmin werden vom Fe-Gehalt und vom Magnetfeld stark beeinflust. Oberhalb von 10 T ist der Koeffizient a konstant und Tmin andert sich nur wenig. MR ist proportional zum Quadrat der Magnetisierung σ. Aus dem Vergleich dieser Ergebnisse mit bekannten Theorien wird die Annahme unterstutzt, das das Widerstandsminimum magnetischen Ursprungs ist.

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