Patent ID: 7241518
Filing Date: 2007-07-10
Classification: G11B

Abstract:
1. A magnetic recording medium comprising: a magnetic layer including a maghemite thin film containing cobalt formed on a tape-shaped substrate including aromatic polyimide, wherein the thickness of said substrate is 3 to 10 μm and the ten-point average roughness (SRz) of a surface of said substrate on which said magnetic layer is formed is 15 to 30 nm, and wherein the thickness of said magnetic layer is 10 to 50 nm, the center plane average roughness (SRa) of said magnetic layer is 0.1 to 3.0 nm and the in-plane coercivity of said magnetic layer is 2,000 to 4,000 Oe (158,000 to 316,000 A/m).