| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that when a non-magnetic layer is increased to decrease a squareness ratio S, a saturated magnetic field Hs is increased and current response characteristics of a perpendicular magnetic recording head are decreased, and, when a film thickness of a FeCo ferromagnetic layer is decreased to decrease the squareness ratio S, overwrite characteristics deteriorate, while a multilayer film with the FeCo ferromagnetic layer and non-magnetic layer laminated is used conventionally as a main pole to prevent erasure after recording and a ferromagnetic layer is coupled antiferromagnetically to reduce residual magnetization and reduce the squareness ratio S. SOLUTION: In the main pole 2 of the perpendicular magnetic recording head 1, an NiFe soft magnetic layer 24 is inserted into the FeCo ferromagnetic layer 22. By inserting the NiFe soft magnetic layer 24 at a position 1 to 7 nm apart from the non-magnetic layer 26, it is possible to reduce the residual magnetization Mr without changing the number of non-magnetic layers 26 and the layer thickness of the FeCo ferromagnetic layer 22, and significantly reduce the squareness ratio S. By this means, it is possible to prevent erasure after recording. COPYRIGHT: (C)2009,JPO&INPIT
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