Preparation and magnetic properties of MnFePSi-based glass-coated microwires

Abstract

We prepared a Mn48Fe22P15Si15 glass-coated microwires (GCMWS) with metallic nucleus diameter, d = 11.2 μm and total diameter, D = 28.3 μm (geometrical aspect ratio d/D = 0.4) for the first time by using the Taylor–Ulitovsky Technique. This low-cost, single-step fabrication approach enabled the preparation of kilometers-long GCMWS from a few grams of low-cost components (Mn, Fe, P, and Si) for a variety of applications. The analysis of the magnetic measurements revealed a well-defined magnetic anisotropy in the whole temperature range. Moreover, relatively hard magnetic properties were observed for the temperature range of 5–400 K, where the average of coercivity, Hc ≈ 465 Oe. Notable magnetic field, H, and temperature dependencies of the magnetic properties were observed. Substantially irreversible magnetic behavior with a blocking temperatures Tb = 97 K at H = 1 kOe and Tb = 50 K at H = 5 kOe upon field cooling was observed. The modification in the magnetic properties of MnFePSi-glass-coated microwires is ascribed to the presence of various magnetic phases resulting from internal stresses induced by the glass coating. Moreover, the elevated Curie temperature (Tc > 400 K) observed in the investigated sample, makes this material as an appealing choice for several industrial applications.