MAGNETO-RESISTIVE MAGNETIC HEAD AND PRODUCTION OF MAGNETO-RESISTIVE MAGNETIC HEAD

PURPOSE: To assure desired electromagnetic conversion characteristics and to protect the constituting films of a read element against etching by increasing the film thickness of the upper shield of a magnetic head only on the MR sensor and reducing the film thickness in other regions. CONSTITUTION: A ceramic substrate 1 is provided thereon with a lower shielding film 2 consisting of a magnetic film of NiFe, etc., and a lower gap film 3 consisting of an insulating film of alumina, etc., and is formed thereon with a magneto-resistance effect film 5. An electrode conductor layer 6 playing a role of supplying electric current for acting the layer as a sensor is formed thereon. A magnetic domain control film 4 for controlling the magnetic domain of the film 5 is formed simultaneously with the film 5. Next, an upper gap film 7 consisting of an insulating film, the upper shielding film 8 consisting of a magnetic film and a gap for a write element are successively formed. At this time, the thickness of the film 8 is formed selectively thick only on the MR sensor. The shield 8 is thereafter formed. The write head element 9 is formed thereon and finally, terminals for connecting lead wires are formed.