A method is disclosed for precisely aligning the pole tips of a thin film magnetic head. Two separate metallic layers, such as Permalloy (Ni-Fe alloy) are separated by a layer of insulating material such as silicon dioxide or AL.sub.2 O.sub.3 which will serve as the insulative spacer of the final magnetic...http://www.google.es/patents/US4436593?utm_source=gb-gplus-sharePatente US4436593 - Self-aligned pole tips
