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Patent Searching and Data


Title:
MAGNETIC RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2019/159466
Kind Code:
A1
Abstract:
This magnetic recording medium having a tape shape includes: a substrate; a base layer provided on the substrate; and a magnetic layer which is provided on the base layer and contains a magnetic powder including hexagonal ferrite. The base layer and the magnetic layer contain a lubricant. The magnetic layer has a surface provided with a large number of holes, and the arithmetic mean roughness Ra of the surface is 2.5 nm or less. The BET specific surface area of the entire magnetic recording medium from which the lubricant has been removed is 3.5 m2/mg or more. The squareness ratio in a vertical direction is 65% or more, the average thickness of the magnetic layer is 90 nm or less, and the average thickness of the magnetic recording medium is 5.6 μm or less.

Inventors:
YAMAGA, Minoru (Konan Minato-k, Tokyo 75, 〒1080075, JP)
IWAMA, Takanobu (Konan Minato-k, Tokyo 75, 〒1080075, JP)
TAKAHASHI, Jun (Konan Minato-k, Tokyo 75, 〒1080075, JP)
Application Number:
JP2018/042739
Publication Date:
August 22, 2019
Filing Date:
November 19, 2018
Export Citation:
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Assignee:
SONY CORPORATION (1-7-1, Konan Minato-k, Tokyo 75, 〒1080075, JP)
International Classes:
G11B5/70; G11B5/706; G11B5/71; G11B5/78
Attorney, Agent or Firm:
SUGIURA, Masatomo et al. (402 Kadora Building, 1-1-11 Minami Ikebukuro, Toshima-k, Tokyo 22, 〒1710022, JP)
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