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Patent Searching and Data


Title:
MAGNETIC RECORDING MEDIUM AND CARTRIDGE
Document Type and Number:
WIPO Patent Application WO/2019/160145
Kind Code:
A1
Abstract:
[Problem] To provide a technique capable of further improving the recording density of data. [Solution] A magnetic recording medium according to the present disclosure comprises a base, a magnetic layer, and a nonmagnetic layer that is provided between the base and the magnetic layer and that comprises one or more types of nonmagnetic inorganic particles. The magnetic recording medium is in the form of a tape which is long in the longitudinal direction and short in the width direction. The magnetic layer comprises a data band which is long in the longitudinal direction and to which a data signal is to be written and a servo band which is long in the longitudinal direction and to which a servo signal is to be written and has a degree of vertical orientation of 65% or more. The half width of an isolated waveform in a reproduction waveform of the servo signal is 195 nm or less. The magnetic layer has a thickness of 90 nm or less. The nonmagnetic layer comprises at least Fe-based nonmagnetic particles as the nonmagnetic inorganic particles. The average particle volume of the Fe-based nonmagnetic particles is 2.0 × 10-5μm3 or less. The nonmagnetic layer has a thickness of 1.1 μm or less.

Inventors:
TERAKAWA, Masaru (1-7-1 Konan Minato-ku Tokyo, 75, 〒1080075, JP)
YAMAGA, Minoru (1-7-1 Konan Minato-ku Tokyo, 75, 〒1080075, JP)
IWAMA, Takanobu (1-7-1 Konan Minato-ku Tokyo, 75, 〒1080075, JP)
TAKAHASHI, Jun (1-7-1 Konan Minato-ku Tokyo, 75, 〒1080075, JP)
Application Number:
JP2019/005895
Publication Date:
August 22, 2019
Filing Date:
February 18, 2019
Export Citation:
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Assignee:
SONY CORPORATION (1-7-1 Konan, Minato-ku Tokyo, 75, 〒1080075, JP)
International Classes:
G11B5/70; G11B5/584; G11B5/706; G11B5/78
Attorney, Agent or Firm:
OMORI, Junichi et al. (2nd Floor, U&M Akasaka Bldg. 7-5-47 Akasaka, Minato-k, Tokyo 52, 〒1070052, JP)
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