Tailoring of Magnetic Properties of Amorphous Ferromagnetic Microwires

This article is a brief review of new different ways to tailor the magnetic properties of amorphous ferromagnetic microwires of two types: glass-coated and glassless. Metallic core of the studied samples was manufactured from CoFe-, Co-, and CoFeNi-based alloys by quenching and drawing or by the Taylor-Ulitovsky methods. We tested the following options to tailor the magnetic properties: changing of the parameters of manufacturing process, annealing, magnetostatic interaction in the array of wires. For the first time, it was found that a system of Co-based microwires with nearly zero magnetostriction coefficient exhibits a step-like hysteresis loop. The same behavior was found for single microwires with compositions of Fe Si-77.5 (7.5) B (15) and Fe Co-45 Si-30 (10) B (15) produced under certain conditions. The effect of stress-annealing was investigated for Fe Co-67.5 (7.5) B Si-15 (10), Fe Co-52.5 (22.5) B Si-15 (10), and Fe Co-37.5 (37.5) B Si-15 (10) glass-coated microwires.