A Study Of The Aftereffect Of The Magnetic Permeability In Co-rich Amorphous Ferromagnetic Alloys

Room-temperature measurements of saturation magnetization, saturation magnetostriction, and aftereffect of the magnetic permeability have been performed on a set of Co-based amorphous ferromagnetic alloys with magnetostriction values in the range -4×10-6 ≲λs≲+1×10-6. The theoretical relation between aftereffect and λs has been verified to hold also in Co-rich amorphous alloys. The fraction of atoms participating in the ordering processes giving rise to the aftereffect is calculated to be of the order 10-4. The aftereffect is shown to be related, even in these alloys, to a damping of 180°Bloch walls, whose thickness increases with decreasing λs. The influence of the alloy's stability on the permeability aftereffect is discussed in detail.6093258326