Anomalous Behavior of Permeability Around the Curie Temperature in Amorphous Fe-Ni-Si-B Alloys

Abstract

The temperature dependence of initial permeability μi is measured in the temperature range from 4.2 K to the Curie temperature for amorphous (Fe1‐xNix)77Si10B13 (x ≧ 0.8) alloys. Anormalous peaks (1 to 3 peaks) are observed in the μ‐T curves near the Curie temperature. The change in the peaks with increasing the driving magnetic field is examined for x = 0.8 and 0.9 alloys. Based on these results, the anomalous peaks in addition to the Hopkinson peak can be explained in terms of the natural magnetic resonance.

The magnetic after-effect in amorphous and nanocrystalline Fe - Cu - Nb - Si - B alloys

“…A similar effect occurs during measurements of the magnetic susceptibility, which shows a sharp peak in a narrow temperature region around the Curie temperature. This behaviour of the magnetic susceptibility was observed for both the amorphous [48] and the crystalline [21,49,50] materials.…”