A new method has been developed to measure the magnetic after-effect when the peak value of alternating current (a.c.) magnetization is constant. After demagnetization, an a.c. magnetic field is applied and recorded as a function of time while the peak value of magnetic induction is held constant by adjusting the amplitude of the field. The stabilization Hsand the increase of reluctivity Δr can be obtained from the recorded field. A cobalt-based amorphous sample has been measured using this method after longitudinal magnetic annealing. The maximum value of Hsis about 0.17 mA cm-1, and the change of Δr with field does not have a peak, unlike that found by traditional measurements. © 1988.
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