| 摘要 |
PROBLEM TO BE SOLVED: To prevent deterioration of recording performance in high frequency recording by forming a magnetic cap with a magnetic film of two or more layers and by setting a specific resistance of a magnetic film of at least single layer of magnetic film to the value higher than that of the other magnetic film. SOLUTION: Under the lower magnetic film 5 working as an upper shielding film, MR and GMR film are provided as a reproducing head. At a part 11 of this lower magnetic film, a non-magnetic film having a high specific resistance (80μΩcm or higher) is formed by the sputtering method, etc., as a gap film 4. As a magnetic film satisfying this characteristic, a film having a high specific resistance can be obtained by simultaneously adding oxygen, nitrogen and an element having intensive affinity thereto, for example, Fe, CoFe alloy, etc. On this film having high specific resistance, a lower layer film 3 is formed, a resist frame 2 is formed thereon to form an upper magnetic film 1 by the plating method. Here, drop of recording performance can be controlled in the high frequency range by setting the thickness of high specific resistance film to 0.5 to 3 times the thickness of the gap film.
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