Plattenförmiges magnetisches Aufzeichnungsmedium

摘要

PCT No. PCT/JP83/00007 Sec. 371 Date Sep. 9, 1983 Sec. 102(e) Date Sep. 9, 1983 PCT Filed Jan. 10, 1983 PCT Pub. No. WO83/02520 PCT Pub. Date Jul. 21, 1983.The present invention provides a disc-shaped magnetic recording medium particularly suitable for high density recording obtainable a high output power with low noise. In the disc-shaped magnetic recording medium according to the present invention, a ferromag netic powder having a coercive force of about 1,000 Oe or higher and a BET specific surface area in the range from about 25 to 70 m2/g is employed. This allows a decrease in noise level and satisfies the electromagnetic performance requirements for high density recording. A random (unoriented) orientation or a circumferential orientation of the ferromagnetic powder in the magnetic layer provides high output power without causing a variation in output power.