Magnetooptical disks using double-layered Tb-Fe-Co films have been developed to obtain a high carrier-to-noise ratio (CNR). The two layers, which have different compositions, are coupled by a magnetic exchange interaction. The recording characteristics and reliability of the double layer have been studied. Optimized double-layered Tb-Fe-Co films and SiN/sub x/ protective layers were fabricated on polycarbonate pregrooved substrates. Better than 50-dB CNR, wide power margin, and high recording sensitivity were obtained at 3.7 MHz for 30-mm disk radius and 1800-r.p.m. disk rotation speed. The result of acceleration testing showed that the disks exhibit high reliability.
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机译：已经开发出使用双层Tb-Fe-Co膜的磁光盘，以获得高的载噪比（CNR）。具有不同组成的两个层通过磁交换相互作用耦合。已经研究了双层的记录特性和可靠性。在聚碳酸酯预刻槽基板上制备了优化的双层Tb-Fe-Co膜和SiN / sub x /保护层。对于3.7mm的磁盘半径30mm和1800r.p.m，CNR优于50dB，具有宽的功率裕度和较高的记录灵敏度。磁盘旋转速度。加速测试的结果表明，这些磁盘具有很高的可靠性。
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