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Perpendicular magnetic recording head with improved write field gradient

  • US 6,813,115 B2
  • Filed: 09/05/2002
  • Issued: 11/02/2004
  • Est. Priority Date: 04/18/2002
  • Status: Expired due to Fees
First Claim
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1. A perpendicular magnetic recording head comprising:

  • a magnetic main pole;

    a coil magnetically coupled to the main pole for magnetizing the main pole in a first magnetization direction; and

    a layer of ferromagnetic material anti-ferromagnetically coupled to the main pole such that magnetization of the ferromagnetic layer is in a second magnetization direction substantially anti-parallel to the first magnetization direction of the main pole, wherein the ferromagnetic layer has a saturation magnetic flux density equal to or less than a saturation magnetic flux density of the main pole.

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