| 摘要 |
PURPOSE: To realize an MR head of a low resistance at a high yield by facilitat ing joining of the longitudinal bias film and electrode film of MR head with an MR film. CONSTITUTION: The MR head including central regions sensing medium magnetic field formed on base bodies 1 to 5 and end regions 13 to 15 which exist across the central regions from both end faces in these central regions and have a function to impress the longitudinal bias on the central regions is provided. The central regions consist of the laminated structure films of the SAL film 5, magnetic sepn. film 6, MR film 7, protective film 8 and insulating film 9 in order of proximity to the base bodies. The film thicknesses and ion milling speeds of the respective films are defined asδa , Ra for the transverse bias film,δb ,δb for the magnetic sepn. film,δc , Rc for the magnetoresistance film,δe , Re for the protective film andδd , Rd for the insulating film. At this time, the film thicknesses and more particularly, the film thicknesses of the insulating film are so controlled as to satisfy (δa /Ra )+(δb /Rb )<(δc /Rc )+(δd -/Rd )+(δe /Re ).
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