MAGNETIC READ HEAD WITH SPIN VALVE SENSOR, MAGNETIC HEAD ASSEMBLY, METHOD FOR MANUFACTURING THEM AND MAGNETIC DISK DRIVE

摘要

PROBLEM TO BE SOLVED: To decrease a ferromagnetic coupling field between a pinned layer and a free layer by constituting a pinned layer structure including two cobalt- based films and a nickel based intermediate film, and arranging the intermediate film between the two films. SOLUTION: A nickel iron (NiFe) intermediate film 406 is arranged between a first cobalt(Co) film 408 and a second cobalt(Co) film 410 of a second AP pinned layer 402. The cobalt(Co) layer 408 becomes a shield layer to the nickel iron (NiFe) layer 406 and the nickel iron (NiFe) layer 406 becomes a shield layer to the second cobalt(Co) layer 410 by sequentially forming the layers 408, 406 and 410. A multi-film structure of the second AP pinned layer 402 enhances a smoothness of these layers, and decreases a ferromagnetic coupling field. An increase in smoothness of surfaces of the layers decreases a ferromagnetic coupling field between the second AP pinned layer 402 and a free layer 206.