MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDER/REPRODUCER

摘要

A ferromagnetic metal thin film whose remanence coercive force has a temperature coefficient of 7 Oe/deg. - 12 Oe/deg. and has a temperature coefficient not larger than 1.7 x {(Ho - Hr)/T} (where Ho denotes the remanence coercive force when the influence of thermal fluctuation does not exist, Hr denotes the remanence coercive force and T denotes the absolute temperature) is used to reduce the medium noise at the time of reproduction and to suppress the temperature coefficient of the coercive force of a magnetic medium. A recording head whose magnetic pole is partially composed of the ferromagnetic metal thin film and a reproducing head in which a magnetoresistance effect device is used are combined to provide a magnetic disc apparatus which has a recording density not lower than 2 Gbit/in<2> and can withstand an operation temperature of 0 - 60 DEG C.