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US 6,632,548 B2Granted
Magnetic disk comprising a magnetic layer having specific projections distributions
AssigneeFuji Photo Film Co., Ltd.
InventorsShinji Saito, Takeshi Kakuto
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Abstract
A magnetic disk for high-density recording is provided, wherein a substantially non-magnetic lower layer is formed on a support and a magnetic layer containing ferromagnetic powder dispersed in a binder is formed on the lower layer. The magnetic layer has a thickness of 0.02 to 0.5 μm, and on the surface thereof at least 1×104 projections standing at least 20 nm high and at most 1×103 projections standing at least 70 nm high per mm2 measured by an atomic force microscope.
Claims14
A magnetic desk comprising:
- a support;
- a substantially non-magnetic lower layer;
- and
- a magnetic layer containing a ferromagnetic powder dispersed in a binder, in this order,
- wherein the magnetic layer has a thickness of 0.02 to 0.5 μm and projections on the surface thereof, the number of the projections standing at least 20 nm high measured by an atomic force microscope is at least 1×104 per mm2 and the number of the projections standing at least 70 nm high measured by an atomic force microscope is at most 1×103 per mm2.
2 more elements
Dependencies are inferred from the claim text.