1. 平台首页
  2. 国际专利信息
  • 专利标题:   Perpendicular magnetic recording medium used in magnetic recording and reproducing apparatus, has magnetic layer, and protective layer on nonmagnetic substrate and including graphene and/or laminate of graphene and amorphous carbon.
  • 专利号:   JP2017027641-A, JP6485867-B2
  • 发明人:   NAKAJIMA S, HASEGAWA K, SAKAI S, TSUMURAYA S
  • 专利权人:   SHOWA DENKO KK, JAPAN ATOMIC ENERGY AGENCY, NAT INST QUANTUM RADIOLOGICAL SCI
  • 国际专利分类:   G11B005/64, G11B005/65, G11B005/72
  • 专利详细信息:   JP2017027641-A 02 Feb 2017 G11B-005/72 201714 Pages: 15 Japanese
  • 申请详细信息:   JP2017027641-A JP143984 21 Jul 2015
  • 优先权号:   JP143984

▎ 摘　　要

NOVELTY - A perpendicular magnetic recording medium (31) has a magnetic layer, and a protective layer (24) on a nonmagnetic substrate (20) and including a graphene and/or a laminate of graphene and an amorphous carbon. In Raman spectrum of protective layer, the ratio (2D/G) of a peak height (2D) of two-dimensional band with respect to 6-membered ring structure of laminate of graphene and/or graphene in vicinity of 2700 cm-1, and a peak height (G) of G band with respect to stretching vibration of sp2 bond in the laminate of graphene and/or graphene in vicinity of 1585 cm-1, is 0.4-5. USE - Perpendicular magnetic recording medium e.g. hard-disk drive is used in magnetic recording and reproducing apparatus (claimed). ADVANTAGE - The perpendicular magnetic recording medium has excellent abrasion resistance, slide-resistance, corrosion resistance, reliability and surface smoothness. The magnetic recording and reproducing apparatus formed using the perpendicular magnetic recording medium has high recording density, and improved reading/writing speed, rotation speed. DETAILED DESCRIPTION - A perpendicular magnetic recording medium has a perpendicular magnetic layer, and a protective layer on a nonmagnetic substrate. The protective layer includes a graphene and/or a laminate of graphene and an amorphous carbon. In Raman spectrum of the protective layer, the ratio (2D/G) of a peak height (2D) of the two-dimensional band with respect to 6-membered ring structure of the laminate of graphene and/or graphene in the vicinity of 2700 cm-1, and a peak height (G) of the G band with respect to the stretching vibration of sp2 bond in the laminate of graphene and/or graphene in the vicinity of 1585 cm-1, is 0.4-5. An INDEPENDENT CLAIM is included for magnetic recording and reproducing apparatus. DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of perpendicular magnetic recording medium. Nonmagnetic substrate (20) Soft-magnetic layer (21) Intermediate layer (22) Protective layer (24) Perpendicular magnetic recording medium (31)