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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.

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