Jpn. J. Appl. Phys. 31 (1992) pp. 568-575 |Next Article| |Table of Contents|
|Full Text PDF (1450K)| |Buy This Article|
Multilayered Magneto-Optical Disks for Magnetically Induced Superresolution
Masahiko Kaneko,
Katsuhisa Aratani and
Masumi Ohta
Corporate Research Laboratories Sony Corporation, 6-7-35 Kitashinagawa, Shinagawaku, Tokyo, 141
(Received September 3, 1991; accepted for publication November 16, 1991)
Magnetically induced superresolution (MSR) has been realized in magneto-optical disks using exchange-coupled magnetic multilayer film. Two new detection methods have been developed. In front aperture detection (FAD), the heated area in the light spot is optically masked. In rear aperture detection (RAD), a signal is read out only from the heated area. For higher readout power in RAD, the aperture area is sandwiched by double masks, since another mask is generated in the highest temperature region. The cut-off spatial frequency in both types of detection is more than two times higher than that in conventional detection. A high C/N of 42 dB is obtained in the MSR disks by both methods for a mark length of 0.3 µm.
URL:
http://jjap.jsap.jp/link?JJAP/31/568/
DOI: 10.1143/JJAP.31.568
- K. Aratani, A. Fukumoto, M. Ohta, M. Kaneko and K. Watanabe: Proc. SPIE, Vol. 1499, Optical Data Storage Topical Meeting, Colorado Springs, 1991, p. 209.
- A. Fukumoto, S. Yoshimura, T. Udagawa, K. Aratani, M. Ohta and M. Kaneko: Proc. SPIE, Vol. 1499, Optical Data Storage Topical Meeting, Colorado Springs, 1991, p. 216.
- M. Ohta, A. Fukumoto, K. Aratani, M. Kaneko and K. Watanabe: Proc. Magneto-Optical Recording International Symposium, Tokyo, 1991, p. 319, J. Magn. Soc. Jpn. 15 (1991) Suppl. S1.
- T. Kobayashi, H. Tsuji, S. Tsunashima and S. Uchiyama:
Jpn. J. Appl. Phys. 20 (1981) 2089[JSAP].
- K. Aratani, M. Kaneko, Y. Muto, K. Watanabe and H. Makino: Proc. SPIE Vol. 1078, Optical Data Storage Topical Meeting, Los Angeles, 1989, p. 258.
- M. Kaneko, K. Aratani, Y. Muto, A. Nakaoki, K. Watanabe and H. Makino: Proc. Int. Symp. on Optical Memory, Kobe, 1989, p. 27, Jpn. J. Appl. Phys. 28 (1989) Suppl. 28–3.
