Magnetic and electrical properties of (FeTM)85B15 (TM = Cr, Ni) metallic glasses

Abstract

A systematic investigation using Mössbauer effect, magnetization, and electrical resistivity measurements on Fe85−xCrxB15 and Fe85−xNixB15 (x = 5 to 30) metallic glasses is presented. Mössbauer spectra at 4.2 K show that the Cr alloys possess a two‐peaked distribution of magnetic hyperfine fields, whereas the Ni‐substituted alloys have a single‐peaked distribution. A consistent description of the magnetic properties of these alloys is obtained based on the assumption that chromium bears zero magnetic moment and nickel 0.6 Bohr magnetons. The temperature depencence of resistivity for alloys near the ferromagnetic transition is ascribed mainly to scattering by spin fluctuations. This can also account for same of the resistivity minima if combined with a structural resistivity term which decreases with temperature. Significant differences are found between the properties of these glasses with 15% boron and similar glasses richer in boron. Show more