Magnetic and electrical properties of iron-nickel-chromium-metalloid glasses

Authors

H. Sadate-Akhavi, University of Nebraska - Lincoln
George C. Hadjipanayis, University of Nebraska-LincolnFollow
David J. Sellmyer, University of Nebraska-LincolnFollow

Date of this Version

11-1-1981

Comments

Published by American Physical Society. Phys. Rev. B24, 5318 (1981). http://prb.aps.org. Copyright © 1981 American Physical Society. Permission to use.

Abstract

The magnetic and electrical properties of amorphous (Fe_1-xNi_x)_78-yCr_ySi₁₀B₁₂ alloys have been measured between 4.2 and 300 K. Alloys with x≤0.9 and y=5 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≃10⁶ erg/cm³. The magnetization at low temperatures follows a T^3/2 law leading to a spin-wave stiffness coefficient D≃90 meV Ų. The x=1, y=5 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 Ni₇₃Cr₅Si₁₀B₁₂ is associated with a spin freeze-out of the Kondo effect due to local moments on Cr atoms.