MAGNETIC MATERIALS AND MARKING

摘要

A non or weakly magnetic metal oxide precursor material containing iron is irradiated by laser to cause the precursor material to become strongly magnetic. The precursor material may comprise a single iron oxide compound or a mixture thereof, or it may comprise a ferrite. The laser radiation is preferably produced by a pulsed excimer laser. The material may be used to provide magnetic regions in many different applications, for example data storage, security marking.