Magnetic recording medium and production method thereof
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United States of America Patent
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Mar 27, 2001
Grant Date -
N/A
app pub date -
Jun 24, 1998
filing date -
Jun 24, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A magnetic recording medium is formed on a non-magnetic support and a magnetic layer containing a binder and a ferromagnetic powder and having a thickness of 0.7 .mu.m or thinner is formed on the non-magnetic support wherein the surface roughness Ra of the surface of the medium is from 0.5 to 7 nm and the skewness R.sub.SK of the surface of the medium is 0.1 or lower. The magnetic recording medium preferably has a nonmagnetic underlayer containing a binder and non-magnetic particles such as carbon black, between the non-magnetic support and the magnetic layer. The magnetic recording medium has excellent electromagnetic recording characteristics and torque characteristics and is suitable for high-density recording.
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