Abstract
The ferromagnetic amorphous alloys Co-Fe-B-Si-Cr and Co-Fe-B-Si-Ta were systemically investigated. [(Co1−xFex)0.75B0.2Si0.05]96Cr4 (x = 0, 0.1, 0.4, 0.7, 1.0) and [(Co1−xFex)0.75B0.2Si0.05]96Ta4 (x = 0, 0.1, 0.3, 0.5, 1.0) ribbons were prepared by using the melt-spinning technique. Amorphous structures were confirmed by the presence of a broad and halo peak in X-ray diffraction (XRD). The thermal characteristics, such as the glass transition temperature (Tg), the crystallization temperature (Tx) and the supercooled liquid region (ΔTx = Tx − Tg), were measured by means of a differential scanning calorimeter (DSC). For the Co-Fe-B-Si-Cr alloys, the values of ΔTx were in the range of 51.6–61.4 K, and for Co-Fe-B-Si-Ta alloys, they were in the range of 39.3–55.5 K. The magnetic properties were examined by means of a vibrating sample magnetometer (VSM) at a maximum field strength of 3000 Oe. These glassy ribbons exhibited soft magnetic properties. The saturation magnetization (Ms) and the coercive force (Hc) were in the ranges of 307.85–854.52 emu·cm3 and 0.64–0.89 Oe, respectively.
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