Magnetization studies of Cr concentration effects in amorphous Fe–Ni–Cr–B–Si ribbons

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Abstract
We report here our results on magnetization (σ) studies of amorphous Fe40−x/2Ni40−x/2CrxMo2B8Si10 ribbons with 0<x<5 (vacuum-schmelze) in the range 4.2 to 300 K and in applied fields up to 150 kOe. Both magnetization and TC are decreased with the addition of Cr the former amounting to 0.05 μB/at.Cr at 4.2 K. For x=0, taking μFe=2.2 μB, we find μNi=0.25 μB. The decrease in moment at 4.2 K with x is discussed assuming a constant Fe and Ni moment. Though a value of −4 μB for Cr gives the best fit this value is considered unreasonable. Friedel’s model describes fairly well the decrease in μ due to Cr addition. However, the situation ought to be more complex. The temperature dependence of σ follows Bloch’s law for the range T/TC=0.4 to 0.6 D/TC is found to be constant which indicates that Cr does not modify the range of exchange interaction. High field susceptibility is also described.