Magnetic Head Instability
Original Publication Date: 1988-Aug-01
Included in the Prior Art Database: 2005-Feb-15
Instability and noise in thin film magnetic heads are noticed when the thin metal, such as nickel-iron films, are left unprotected during processing, in particular, during a photoresist curing cycle. This instability was found to be due to the long period of time when the metal film is in contact with solvent vapors released from the photoresist during curing. To prevent this instability, one step during processing includes the deposition of a thin insulator layer, such as an alumina film, on the metal film layer prior to the coating by the photoresist layer and the subsequent baking procedures.