The magnetic and electrical properties of amorphous ${\left({\mathrm{Fe}}_{1-x}{\mathrm{Ni}}_x\right)}_{78-y}{\mathrm{Cr}}_y{\mathrm{Si}}_{10}{\mathrm{B}}_{12}$ alloys have been measured between 4.2 and 300 K. Alloys with $x\le 0.9$ and $y=5\mathrm{}$ order ferromagnetically. High-field magnetization measurements show saturation in moderate fields suggesting a relatively high value of magnetic anisotropy which was estimated to be $K\simeq {10}^6$ erg/${\mathrm{cm}}^3$. The magnetization at low temperatures follows a $T^{\frac{3}{2}}$ law leading to a spin-wave stiffness coefficient $D\simeq 90$ meV ${\mathrm{\AA }}^2$. The $x=1\mathrm{}$, $y=5\mathrm{}$ alloy behaves like a "cluster glass" with a cluster ordering temperature around 20 K. Resistivity measurements show minima at low temperatures which can be explained with a modified Kondo mechanism. The resistivity maximum which appears around the cluster ordering temperature in ${\mathrm{Ni}}_{73}$${\mathrm{Cr}}_5$${\mathrm{Si}}_{10}$${\mathrm{B}}_{12}$ is associated with a spin freeze-out of the Kondo effect due to local moments on Cr atoms.

• Received 30 June 1980

DOI:https://doi.org/10.1103/PhysRevB.24.5318