Invention Grant
US07862916B2 Perpendicular magnetic recording medium and magnetic storage device 有权
垂直磁记录介质和磁存储装置

  • Patent Title: Perpendicular magnetic recording medium and magnetic storage device
  • Patent Title (中): 垂直磁记录介质和磁存储装置
  • Application No.: US12362677
    Application Date: 2009-01-30
  • Publication No.: US07862916B2
    Publication Date: 2011-01-04
  • Inventor: Ryosaku Inamura
  • Applicant: Ryosaku Inamura
  • Applicant Address: JP Tokyo
  • Assignee: Showa Denko K.K.
  • Current Assignee: Showa Denko K.K.
  • Current Assignee Address: JP Tokyo
  • Agency: Staas & Halsey LLP
  • Priority: JP2008-023113 20080201
  • Main IPC: G11B5/66
  • IPC: G11B5/66
Perpendicular magnetic recording medium and magnetic storage device
Abstract:
The perpendicular magnetic recording medium includes a non-magnetic underlayer composed of Ru or an Ru alloy having a columnar structure in which crystalline particles are isolated from each other by a space, a non-magnetic granular layer provided on the non-magnetic underlayer and composed of crystalline particles and a non-soluble phase and a granular magnetic layer provided on the non-magnetic granular layer and composed of CoCrPt alloy crystalline particles and the non-soluble phase, wherein when a lattice constant in an in-plane direction of the non-magnetic underlayer is a1, the lattice constant in the in-plane direction of the non-magnetic granular layer is a2, and the lattice constant in the in-plane direction of the granular magnetic layer is a3, the relation a1>a2>a3 is satisfied.
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