Room temperature magnetic properties of Mn-Ga-B melt-spun ribbons

Abstract

In this study, we synthesized Mn65Ga35-δBδ (δ = 0–10) alloys using the melt-spinning technique. In the as-quenched state, the alloys consisted of the D019 and Mn8Ga5 phases in the as-quenched state. After heat treatments, the Mn65Ga35 alloy consisted of the D022 phase, whereas the Mn65Ga30B5 and Mn65Ga25B10 alloys were mainly composed of the D019 phase. The magnetization of the Mn65Ga30B5 and Mn65Ga25B10 alloys was smaller than that of the Mn65Ga35 alloy, but the Mn65Ga30B5 and Mn65Ga25B10 alloys exhibited higher coercivity than the Mn65Ga35 alloy. The highest coercivity of 8.7 kOe was measured at room temperature in the Mn65Ga30B5 alloy with the fined grains of the D019 phase.