Patent ID: 7075402

Claim:
A process for the treatment of only a single thin brittle metal strip ( 1 , 30 ) which is made of a soft magnetic alloy having a nanocrystalline structure, that is to say containing at least 50 vol % of fine crystals having a size of less than 100 nm, obtained by casting the soft magnetic alloy in the form of an amorphous strip and by heat treatment of the amorphous strip, and which has a thickness of less than 0.1 mm, comprising at least one step in which the thin strip ( 1 , 21 a , 21 b , 21 c , 30 ) is subjected to stresses, characterized in that, prior to the step of the process in which the thin strip ( 1 , 21 a , 21 b , 21 c , 30 ) is subjected to stresses, at least one side of the strip is covered with a coating layer ( 3 , 3 â€², 31 ) made of at least one polymer film so as to obtain, on the strip, an adhesive layer having a thickness of between 1 and 100 Î¼m, modifying the deformation and fracture properties of the thin metal strip, and in that the step of the process in which the thin strip is subjected to stresses is carried out on the strip covered with the coating layer.