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PMR write head with narrow gap for minimal internal flux loss

  • US 8,238,059 B1
  • Filed: 04/06/2011
  • Issued: 08/07/2012
  • Est. Priority Date: 04/06/2011
  • Status: Active Grant
First Claim
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1. A perpendicular magnetic recording (PMR) writer, comprising:

  • (a) a main pole comprised of a trailing side and a leading side with respect to a down-track direction, and two sides connecting said leading and trailing sides;

    said leading side has a leading edge at an air bearing surface (ABS) and said trailing side has a trailing edge at the ABS;

    (b) a gap layer adjacent to and surrounding the main pole at the ABS wherein said gap layer includes a write gap along the trailing side and trailing edge, a lead gap along the leading side and leading edge, and a side gap along each of the sides of the main pole;

    (c) a first shield section formed adjacent to at least one of the write gap, side gaps, and lead gap, said first shield section is comprised of an anisotropic (-Ku) magnetic material with a hard axis in a direction toward the main pole and a magnetization that is induced in a direction orthogonal to the hard axis with a weak magnetic field; and

    (d) an isotropic magnetic shield formed adjacent to each first shield section on a side thereof facing away from the main pole, and contacting portions of the gap layer that are not adjacent to a first shield section.

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