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Magnetic recording disk with antiferromagnetically-coupled magnetic layer having multiple ferromagnetically-coupled lower layers

  • US 20050214586A1
  • Filed: 03/23/2004
  • Published: 09/29/2005
  • Est. Priority Date: 03/23/2004
  • Status: Active Grant
First Claim
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1. A magnetic recording disk comprising:

  • a substrate;

    a first lower ferromagnetic layer on the substrate and having a remanent magnetization Mr, a thickness t and a remanent-magnetization-thickness product Mrt;

    a ferromagnetically-coupling layer on the first lower ferromagnetic layer;

    a second lower ferromagnetic layer on the ferromagnetically-coupling layer and having an Mrt;

    an antiferromagnetically-coupling layer on the second lower ferromagnetic layer; and

    an upper ferromagnetic layer on the antiferromagnetically-coupling layer and having an Mrt greater than the sum of the Mrt values of the first and second lower ferromagnetic layers.

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