Magnetic anisotropy in FeSiB amorphous glass-covered wires

Abstract

Results on the helical magnetic anisotropy in positive magnetostrictive amorphous glass-covered magnetic wires are presented. Measurements of the circumferential magnetization component in Fe77.5Si7.sB~ amorphous glasscovered wires show the existence of a non diagonal anisotropy component that determines an inclination of the easy axis of magnetization in the inner region o f as-cast wires. Applied torque leads to an increase o f the azimuthal magnetization and contributes to the increase of the easy axis inclination, determining an increase o f the switching field at which the axial magnetization reversal occurs in these wires. The torsion sensitivity of wires after glass removal is higher than that of glass-covered wires.

Local magnetization profile and geometry magnetization effects in microwires as determined by magneto-optical Kerr effect

“…To account for that, we should assume that magnetization actually exhibits a helical, rather than pure longitudinal, configuration inside the large central domain with a significant angle from the axis of the wire. 27 …”