Sony Corporation

Kaken Chemical Co., Ltd.

Yuko Nakamura

Atsushi Takeuchi

Jun Shimizu

Yoshihito Fukushima

Masayuki Kinoshita

Nobutake Kagami

Takeshi Gouko

Yukio Miyazaki

Masayuki Hara

Akira Shibata

Manabu Iwai

Yuichiro Doi

Tateo Yahagi

Kaoru Hara

Singo Yoneda

Hiroko Kasahara

A magneto-optical recording medium from which data is read by using a Kerr effect and which is capable of preventing signal imbalance caused from change in birefringence even in a system in which the amplitude of a reproduced signal is small and the spatial frequency of a shortest record signal train of the magneto-optical recording medium is 1.1&times;NA/&lgr;(line/m) or higher. The photoelastic coefficient of a substrate of the magneto-optical recording medium is 50&times;10,cm,/dyne or smaller. The vertical birefringence of the substrate is 250&times;10,or smaller, the coefficient of water absorption of the same is 0.2 wt % or lower and the thermal coefficient of expansion of the same is 6.5&times;10,cm/cm&middot;&deg; C. or lower.

Magneto-optical recording medium

A magneto-optical recording medium comprises, at least a transparent base plate, a dielectric layer formed on one major surface of the transparent base plate, and a recording magnetic layer formed over the dielectric layer. The dielectric layer may be a single-layer structure consisting of a dense dielectric film or may be a two-layer structure consisting of a porous dielectric film formed contiguously with the transparent base plate, and a dense dielectric film formed contiguously with the recording magnetic layer. The magneto-optical recording medium has high recording magnetic field sensitivity and excellent mechanical properties, and is capable of satisfactorily functioning for recording/reading operation on either a magnetic modulation recording system or an optical modulation recording system.

Magnetooptical recording medium having improved sensitivity

Video cassette tape

Audio cassette tape

Polyether type antibiotics are produced by culturing a polyether type antibiotic-producing microorganism in a medium containing a fatty acid or its precursor and ammonia or an ammonium salt or urea.

Method of producing salinomycin antibiotics

Growing community of inventors

Miyagi, Japan

Yuko Nakamura