MGNETO-OPTICAL RECORDING MEDIUM, ITS REPRODUCING METHOD AND REPRODUCER

• Main Authors: SHIMAZAKI KATSUSUKE, NAGAI NOBUYUKI, YAMAGUCHI AISUSHI, AWANO HIROYUKI, YOSHIHIRO MASAFUMI, OONUKI SATORU, OHTA NORIO, SUMI SATOSHI, SHIRAI HIROSHI
• Format: Patent
• Language: English; Korean
• Published: 25.04.2000
• Edition: 7
• Subjects: INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS

PURPOSE: A magneto-optical recording medium and a signal reproducing method and reproducing apparatus in which a reproduction signal with satisfactory C/N can be obtained even when minute magnetic domains are recorded are provided CONSTITUTION: In this magneto-optical recording medium, the critical temperatures of the first and second auxiliary magnetic layers are set such that the critical temperature in the first auxiliary magnetic layer 5 is less than the critical temperature in the second auxiliary magnetic layer 4. Consequently, magnetic domain 23 which is transferred into second auxiliary magnetic layer 4 is magnified, compared with the size of magnetic domain 21, because of the exchange coupling force from the transfer magnetic domain of first auxiliary magnetic layer5 and the perpendicular magnetic anisotropy of the second auxiliary magnetic layer. Therefore, the reproduction signal detected by means of the magneto-optical effect is amplified as same size as recording magnetic domain 22 in order to make possible reproduction with high C/N. For the case of the transition, the magnetic must be twisted through 90 degree, the thickness of the first auxiliary magnetic layer is greater than the thickness of the magnetic wall of first auxiliary magnetic layer5. 광자기기록매체, 그 재생방법 및 재생장치에 관한 것으로서, 미소자구가 기록된 경우라도 충분한 C/N에서 재생신호가 얻어지는 광자기기록매체, 그 신호재생방법 및 재생장치를 제공하기 위해서, 적어도 정보가 기록되는 광자기기록층, 제1 보조자성층 및 제2 보조자성층을 구비하고, 재생광을 조사했을 때에 광자기기록층에 기록된 기록자구가 제1 보조자성층을 거쳐서 제2 보조자성층으로 확대되어 전사되고, 확대되어 전사된 제2 보조자성층의 자구에서 정보가 재생되는 광자기기록매체에 있어서, 제1 보조자성층이 10㎚을 초과하는 두께를 갖도록 구성하였다. 이와 같이 하는 것에 의해, 광자기기록매체는 초고밀도기록매체로 될 수 있고, 재생클럭에 따라서 펄스변조된 재생자계 또는 재생광을 적용하는 것에 의해 재생스폿중에 존재하는 여러개의 미소자구를 독립하여 고 S/N이고 또한 낮은 에러율로 재생할 있다는 등의 효과가 얻어진다.