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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2021/065018
Kind Code:
The purpose of the present invention is to provide a magnetic recording medium having exceptional electromagnetic conversion characteristics and thermal stability. The present disclosure provides a tape-form magnetic recording medium comprising a base and a magnetic layer that is provided on the base and includes a magnetic powder, the magnetic recording medium being such that: the average thickness of the magnetic layer is 90 nm or less; the average aspect ratio of the magnetic powder is 1.0-3.0; the average particle volume of the magnetic powder is 2300 nm3 or less; the vertical-direction magnetic retention Hc1 of the magnetic recording medium is 4500 Oe or less; the length-direction magnetic retention Hc2 of the magnetic recording medium and the magnetic retention Hc1 satisfy the relationship Hc2/Hc1 ≤ 0.8; and the ratio Hrp/Hc1 of the residual magnetic retention Hrp of the magnetic recording medium to the magnetic retention Hc1 is 2.0 or less, the ratio being measured using a pulse magnetic field.

TERAKAWA Masaru (1-7-1 Konan Minato-k, Tokyo 75, JP)
YAMAGA Minoru (1-7-1 Konan Minato-k, Tokyo 75, JP)
Application Number:
Publication Date:
April 08, 2021
Filing Date:
October 31, 2019
Export Citation:
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SONY CORPORATION (Minato-ku Tokyo, 75, JP)
International Classes:
G11B5/70; G11B5/706; G11B5/714; G11B5/73; G11B5/735; G11B5/738; G11B23/30; G11B15/43
Attorney, Agent or Firm:
WATANABE Kaoru (Hulic Tamachi Bldg. 6F, 4-10-5, Shiba, Minato-k, Tokyo 14, JP)
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