| 摘要 |
A perpendicular magnetic recording head capable of preventing information erasing without intention at the time of non-recording through making the magnetic domain structure of a pole layer appropriate is provided. A main pole layer is formed so as to include a first pole layer portion having a first width W 1 which determines the recording track width of a recording medium and a length L 1 , a second pole layer portion having a width which gradually expands from the first width W 1 to a second width W 2 larger than the first width W 1 (W 2 >W 1 ) and a length L 2 , and a third pole layer portion having a third width W 3 larger than the second width W 2 (W 3 >W 2 ) and a length L 3 . When the ratio W 3 /(L 1 +L 2 +L 3 ) satisfies a relationship of W 3 /(L 1 +L 2 +L 3 )>=1.0, on the basis of the shape magnetic anisotropy of the main pole layer, the magnetic domain structure of the main pole layer is made appropriate so that an unnecessary magnetic flux is not easily leaked at the time of non-recording.
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