Magneto-optical recording materials and technologies
Magneto-optical recording materials and technologies
复制标题
磁光记录材料与技术
DOI：
10.1016/0304-8853(90)90411-i
复制
发表时间：
1990
影响因子：
2.7
通讯作者：
P. Hansen
中科院分区：
文献类型：
--
作者：
P. Hansen
非晶态稀土过渡金属合金薄膜是一类适用于磁光信息存储的材料。它们是亚铁磁体，表现出单轴各向异性。磁性和磁光性能可以通过组成以及沉积条件来很好地定制。信息通过磁区存储，磁区可通过热磁切换过程写入。读取过程利用了磁光克尔效应。目前，最有可能应用于器件的是GdTb-Fe和Tb-FeCo合金。使用多层结构可以实现有源磁光介质的高读出效率和长期稳定性。因此，已实现高达61分贝(30 kHz带宽)的载噪比。还讨论了用于磁光记录的其他介质，如亚铁磁性氧化物和铂钴多层膜。
Thin films of amorphous rare-earth transition-metal alloys represent a suitable class of materials for magneto-optical information storage. They are ferrimagnets and exhibit a uniaxial magnetic anisotropy. The magnetic and magneto-optical properties can be well tailored by the composition as well as the deposition conditions. The information is stored via magnetic domains, which can be written by a thermomagnetic switching process. The reading process utilizes the magneto-optical Kerr effect. At present, the most prominent candidates for device applications are GdTb-Fe and Tb-FeCo alloys. High read-out efficiencies and a long-term stability of the active magneto-optical medium can be realized using a multileyer structure. Thus carrier-to-noise values up to 61 dB (30 kHz bandwidth) have been achieved. Other media like ferrimagnetic oxides and Pt-Co multilayers are also discussed for magneto-optical recording.