Invention Grant
US07781079B2 Perpendicular magnetic recording medium, its manufacturing method, and a magnetic storage apparatus 有权
垂直磁记录介质,其制造方法和磁存储装置

  • Patent Title: Perpendicular magnetic recording medium, its manufacturing method, and a magnetic storage apparatus
  • Patent Title (中): 垂直磁记录介质,其制造方法和磁存储装置
  • Application No.: US11973520
    Application Date: 2007-10-09
  • Publication No.: US07781079B2
    Publication Date: 2010-08-24
  • Inventor: Ryo Kurita
  • Applicant: Ryo Kurita
  • Applicant Address: JP Tokyo
  • Assignee: Showa Denko K.K.
  • Current Assignee: Showa Denko K.K.
  • Current Assignee Address: JP Tokyo
  • Agency: Greer, Burns & Crain, Ltd.
  • Priority: JP2006-276762 20061010
  • Main IPC: G11B5/66
  • IPC: G11B5/66
Perpendicular magnetic recording medium, its manufacturing method, and a magnetic storage apparatus
Abstract:
A perpendicular magnetic recording medium includes a substrate, a soft magnetic lining layer formed on the substrate, and a recording layer. The recording layer includes a first recording layer, an auxiliary recording layer, and a second recording layer that are laminated in this sequence. The first and the second recording layers are ferromagnetic layers that have a magnetization easy axis perpendicular to the layers. The auxiliary recording layer includes two or more magnetic particles mutually separated by non-magnetism members, wherein the magnetic particles are arranged approximately perpendicular to the layer and have the magnetization easy axis in a direction slanted with reference to the layer. The auxiliary recording layer is exchange-coupled with the adjoining first recording layer and second recording layer. The perpendicular magnetic recording medium may include an exchange-coupling-strength control layer between the first recording layer and the auxiliary recording layer, or alternatively, between the auxiliary recording layer and the second recording layer.
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