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US 12,394,436 B2Granted
Magnetic recording medium
AssigneeSony Corporation
InventorsEiji Nakashio, Futoshi Sasaki, Yuuichi Masuzawa, Masaru Terakawa, Minoru Yamaga, Yoichi Kanemaki, Kazuya Hashimoto, Tomoe Sato, Nobuyuki Sasaki
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Abstract
Provided is a magnetic recording medium including: a support body; a base layer containing carbon particle powder and metal-containing particle powder; and a recording layer. In a recording surface, a maximum indentation depth h is 85≤h≤140, and a ratio d of a permanent strain to an elastic recovery (permanent strain/elastic recovery) is 0.95≤d≤1.25.
Claims22
A magnetic recording medium comprising:
- a strip-shaped support body;
- a base layer containing a binder, carbon particle powder and metal-containing particle powder;
- and
- a recording layer,
- wherein in a recording surface, in a case that a maximum indentation depth and a ratio d of a permanent strain to an elastic recovery are measured by a nanoindenter having a dihedral angle of 142.3° and subject to a load that is continuously increased to a maximum load of 200 μN and then the load is removed, the maximum indentation depth h at the maximum load of 200 μN is 85 nm≤h≤140 nm, and the ratio d of the permanent strain to the elastic recovery (permanent strain/elastic recovery) is 0.95≤d≤1.23.
2 more elements
Dependencies are inferred from the claim text.