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US 10,580,447 B2Granted
Magnetic recording medium with controlled surface characteristics
AssigneeSony Corporation
InventorsNoboru Sekiguchi, Tomoe Ozaki, Tetsuo Endo, Takashi Aizawa, Junichi Tachibana, Hikaru Terui, Teruo Sai
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Abstract
A magnetic recording medium has a recording surface having an average surface roughness SRa of 3.0 nm or less, the number of projections having a height of 7.5 nm or more included in a unit region (where the unit region is a square region with each side having a length of 30 μm) of the recording surface is 256 or more, and the number of projections having a height of 15 nm or more included in the unit region of the recording surface is 0 or more and 104 or less.
Claims21
A magnetic recording medium comprising:
- a base substance having flexibility;
- a crystal control layer provided on the base substance;
- and
- a magnetic layer provided on the crystal control layer, wherein
- the magnetic recording medium has a recording surface having an average surface roughness SRa of 3.0 nm or less,
- the number of projections having a height of 7.5 nm or more included in a unit region of the recording surface is 256 or more and 3000 or less, the unit region is a square region with each side having a length of 30 μm, and
- the number of projections having a height of 15 nm or more included in the unit region of the recording surface is 0 or more and 104 or less.
4 more elements
Dependencies are inferred from the claim text.