| 摘要 |
PROBLEM TO BE SOLVED: To provide a constitution in which the fixed layer magnetic moment is stable to a large external magnetic field, and the direction of magnetization of the fixed layer can be controlled by magnetic field applying treatment at room temperature, and to provide the magnetic field applying treatment. SOLUTION: In a magneto-resistance effect type head, the fixed layer is constituted of two ferromagnetic films A and B which are anti-ferromagnetically coupled to each other, and an anti-ferromagnetic coupling film for separating the two ferromagnetic films A and B from each other, and the single coercive force of the ferromagnetic film A is made to 200 (Oe) or more, and the single coercive force of the ferromagnetic film B is made to 20 (Oe) or less. As to the composition of the ferromagnetic film A and the ferromagnetic film B, when it is expressed by Co<SB>100-Y</SB>Fe<SB>Y</SB>(atomic percent), 80≥Y≥40 for the ferromagnetic film A, and 20≥Y≥0 for the ferromagnetic film B, and the film materials in contact with the ferromagnetic film A are characterized by being Ru, Ta, NiFeCr, Cu, and NiFe. COPYRIGHT: (C)2005,JPO&NCIPI |
