| 摘要 |
PURPOSE:To obtain a medium which permits satisfactory recording and erasing with a low impressed magnetic field and low recording power by adjusting the coercive force of a magneto-optical recording layer to >=3.5kOe at an ordinary temp. (25 deg.C). CONSTITUTION:The coercive force of the magneto-optical recording layer of a magneto-optical recording medium which makes recording, reproducing and erasing by projecting condensed laser light to the magneto-optical recording layer essentially composed of a rare earth transition metal and formed on one main surface of a transparent substrate is adjusted to >=3.5kOe at an ordinary temp. (25 deg.C). The magnetic field Hs of the medium having the coercive force Hc up to 3.4kOe remains at about 1.5kOe and does not change even in a high temp. region. Recording and erasing are extremely difficult with such medium. The Hs of the medium having >=3.5kOe Hc decreases with an increase in the temp. and the Hs is substantially small in the high temp. region. The medium with which the recording and erasing are extremely easy is obtd. The laser power and magnetic field required for recording and erasing are extremely small by forming the magneto-optical recording medium in the above-mentioned manner. |
