Magnetoimpedance Hysteresis effects in amorphous glass-coated microwires for embedded sensing applications

Abstract

During the last two decades’ ferromagnetic materials have attracted much attention due to their soft magnetic properties and enhanced electrical resistivity which is useful to implement in various industrial sensing applications. Recently, amorphous glass-coated microwires have become available where soft magnetic properties are combined with specific magnetic
anisotropy. In the present work, the magnetic hysteresis loops and magnetoimpedance effects in C-rich microwires covered with glass have been investigated. This largely depends on the sign of the magnetostriction saturation. Such behaviors were demonstrated in wires of the same composition Co71Fe5B11Si 10Cr3 but with different geometric properties. Depending on
the easy anisotropy direction the wire can exhibit such unique properties as magnetic bistability (magnetization changes abruptly between the two stable states), wall propagation, and giant magnetoimpedance. The wires can be further subjected to internal tensile stress in order to realize stress-sensitive magnetostriction which can be proposed to be used in
embedded sensing sensors.