Structural and Magnetic Properties of Thick Fe31Co34Ni10(SiB)25 Microwires Produced by the Modernized Ulitovsky–Taylor Method

Abstract

Results on the study of the structural and magnetic properties of the as-cast Fe31Co34Ni10(SiB)25 thick microwires with glass shell, produced by the modernized Ulitovsky–Taylor method, are presented. The diameters of the amorphous metallic cores, ${d}$ , of the microwires were equal to 55, 65, 95, 140, and $200~\mu $ m. The microwires had the stable geometric parameters along their lengths and the smooth (almost without defects) surface. The samples under study exhibited the high plasticity and high strength. The destruction of the microwires did not happen even after their full tightening into a knot. It was discovered that the glass shell of the microwires practically does not affect their magnetic characteristics. The saturation field ${H} _{S}$ and coercive force ${H} _{C}$ of the microwires raised with increasing the microwire diameter. The stable geometric parameters of the microwires along their lengths caused the slight dispersion of magnetic anisotropy in the near-surface layers. As a result, the Fe31Co34Ni10 (SiB)25 microwires exhibited the high homogeneity of the near-surface local magnetic characteristics. In particular, the changes of the local magnitudes of the saturation field were revealed to be <5%.