He+ ion irradiation-induced interface mixing modifies the magnetic properti
es of Pt/Co/Pt sandwiches. A strong decrease in magnetic anisotrophy (hence
of the coercivity and Curie temperature) can be controlled without signifi
cant changes in sample roughness or optical properties. This opens exciting
possibilities to develop a planar technology to pattern the magnetic prope
rties of multilayers by irradiation through a lithographically defined mask
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