Patent ID: 6246640
Filing Date: 2001-06-12
Classification: G11B

Abstract:
A recording/reproducing method for an optomagnetic recording medium, wherein an optical head and a magnetic head are driven relative to the optomagnetic recording medium so that an external magnetic field having an applied magnetic field intensity signal-modulated multi-stepwise in accordance with a recording signal is applied from said magnetic head while a recording track of said optomagnetic recording medium is irradiated therealong with a laser beam from said optical head continuously, periodically or pulsewise, whereby an at least 3-valued signal is recorded in said magnetic layers;wherein the optomagnetic recording medium comprises at least two magnetic layers, which are (i) laminated directly together or (ii) laminated together through a non-magnetic layer, each of said magnetic layers being formed by an optomagnetic recording film, wherein magnetization of each of said magnetic layers directs in a certain direction upon recording in a magnetic field region under applied magnetic field to said magnetic layers, said magnetic field region defines amplitude and direction of the magnetic field, and said magnetic field region of each of said magnetic layers differs.