Perpendicular magnetic recording head with side shield and magnetic disk apparatus

  • US 8,169,741 B2
  • Filed: 05/03/2007
  • Issued: 05/01/2012
  • Est. Priority Date: 05/11/2006
  • Status: Active Grant
First Claim
Patent Images

1. A perpendicular magnetic recording head comprising:

  • a main pole which generates a recording magnetic field;

    a return pole which forms a closed magnetic circuit for the recording magnetic field; and

    a single side shield facing side edges on a leading side of the main pole and a leading edge of the main pole, the single side shield being magnetically spaced from the main pole in a cross-track direction and in a down-track direction,wherein a point on a trailing edge of the side shield which is closest to the main pole is positioned on a leading side of a trailing edge of the main pole, andwherein a ratio SSW/PL of a distance SSW between a leading edge of the return pole and the point on the trailing edge of the side shield which is closest to the main pole to a pole length PL of the main pole is ⅓

    to 1.

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