Development of Co-Rich Microwires with Graded Magnetic Anisotropy

Abstract

In this paper, a gradual change in the hysteresis loop of Co-rich glass-coated microwire stress-annealed at variable temperature is observed. Such microwires annealed with a temperature gradient also present a variable squareness ratio and magnetic anisotropy field along the microwire’s length. The obtained graded anisotropy has been attributed to a gradual modification of the domain structure along the microwire originated by a counterbalance between shape, magnetoelastic, and induced magnetic anisotropies. Accordingly, we propose a rather simple route to design graded magnetic anisotropy in a magnetic microwire.

Anomalous Magnetic Behavior in Half-Metallic Heusler Co2fesi Alloy Glass-Coated Microwires with High Curie Temperature

“…The alloys were re-melted several times to improve homogeneity. Magnetic glass-coated microwires were fabricated by the Taylor-Ulitovsky technique, which consists on drawing and casting directly from the melted Co 50 Fe 25 Si 25 alloy [26,[32][33][34][35][36][37]. The diameter of inner metallic nucleus of microwire sample is around 4.36 µm, while the diameter of external Pyrex coating is around 17.55 µm.…”