A method for manufacturing a strip in a soft magnetic alloy capable of being cut out mechanically, the chemical composition of which comprises by weight: 18%≤Co≤55% 0%≤V+W≤3% 0%≤Cr≤3% 0%≤Si≤3% 0%≤Nb≤0.5% 0%≤B≤0.05% 0%≤C≤0.1% 0%≤Zr+Ta≤0.5% 0%≤Ni≤5% 0%≤Mn≤2% The remainder being iron and impurities resulting from the elaboration, according to which a strip obtained by hot rolling is cold-rolled in order to obtain a cold-rolled strip with a thickness of less than 0.6 mm.
After cold rolling, a continuous annealing treatment is carried out by passing into a continuous oven, at a temperature comprised between the order/disorder transition temperature of the alloy and the onset temperature of ferritic/austenitic transformation of the alloy, followed by rapid cooling down to a temperature below 200° C. Strip obtained.