| 摘要 |
PURPOSE:To perform high-speed, high-density recording while improving its reliability by irradiating a magnetic recording medium with a circular polarized beam, and recording information by a vertical magnetic field established in the irradiation area. CONSTITUTION:Light from a laser light source 1 is polarized linearly by a polarizer 3 and changed into circular counterclockwise or clockwise polarized light by an optical phase modulator 4 in accordance with information to be focused on a magnetic alloy film 7 on a medium base plate 6 through a condenser system 5. By the circular polarized laser spot, the information is written by an upward or downward vertical magnetic field produced by a revolving current generated in the magnetic alloy film 7. Unlike recording which utilizes a temperature rise by light irradiation, a response to an information signal is speeded up and it is unnecessary to lower the Curie point of the recording medium, so the preservation of record is made complete to perform the high-speed, high- density recording with improved reliability. |
