Formation, thermal stability and magnetic properties of new melt-spun Mn-Si-B glassy alloys

Abstract In the present work, a series of novel manganese-based Mn-Si-B glassy alloy ribbons were produced by melt-spinning technique. The effects of B/Si ratios on glass formation, thermal stability and magnetic properties for Mn78Si22-xBx (x = 5, 6, 7, 8, 9, 10) alloys have been studied by X-ray diffraction (XRD), differential scanning calorimeter (DSC) and physical property measurement system (PPMS). With increasing B/Si ratios, the glass forming ability of the alloys improves but the thermal stability first increases and then decreases. The Mn78Si22-xBx alloy with x = 8 exhibits the highest onset temperature of crystallization of 898.5 K, which the onset activation energy of crystallization is Ex(K) = 337 ± 14 kJ⋅mol−1 and Ex(O) = 334 ± 13 kJ⋅mol−1 by using the Kissinger and Ozawa models, respectively, showing a rather high thermal stability. Furthermore, thermal-magnetization M(T) curves demonstrate that the Mn78Si22-xBx glassy alloys exhibit a characteristic spin glass behavior below 22 K.