| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic disk device which can prevent the deterioration in a bit error rate by suppressing a recording strain when two magnetic pole cores are used. SOLUTION: The magnetic disk device includes: a magnetic disk including a soft magnetic layer having soft magnetic properties and a perpendicular magnetic recording layer provided thereon; a first magnetic pole core including a main magnetic pole which is used to record a signal onto the magnetic disk, a first return yoke coupled to the main magnetic pole, and a first coupler which couples the main magnetic pole with the first return yoke; a first coil provided and wounded around the first coupler; a second magnetic pole core including a second magnetic pole whose tip portion is provided on a side in a track width direction of the main magnetic pole, a second return yoke coupled to the second magnetic pole, and a second coupler which couples the second magnetic pole with the second return yoke; and a second coil provided and wound around the second coupler. COPYRIGHT: (C)2011,JPO&INPIT
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