Anomaly of Permeability Around Curie Temperature in Amorphous (Fe_1-xNi_x)₇₇Si₁₀B₁₃ Alloys

Abstract

The temperature dependence of initial permeability has been measured in the temperature range from 4.2K to Curie temperature for amorphous (Fe_1-xNi_x)₇₇Si₁₀B₁₃ (x≥0.8) alloys. Anomalous peaks (1∼3 peaks) are observed in μ-T curves near the Curie temperature. The change of the peaks with increasing driving magnetic field has been examined for x=0.8 and 0.9 alloys. Based on these results, the anomalous peaks can be explained in terms of the natural magnetic resonance in addition to the Hopkinson peak.