Pt/Co磁光盘的写入/擦除可循环性

J. Nakamura;H. Awano;H. Miyamoto;M. Takahashi;M. Ojima
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引用次数: 1

摘要

研究了富钴Pt/Co磁盘的写入/擦除可循环性,以及限制可循环性的因素。退火实验表明,CNR的降低是由擦除激光束加热的Pt/Co膜中垂直磁各向异性的退化引起的。降解的主要机制是Pt/Co多层膜界面处的原子混合。在暴露于空气的Pt/Co膜的情况下,Co可能在擦除循环期间被氧化。Pt/Co薄膜的峰值温度越高,混合速度越快。因此,为了降低峰值温度,通过向Pt/Co膜添加热扩散层来增加循环次数。例如,由于峰值温度较低(430°C),Au涂层的Pt/Co盘能够进行105次循环,而峰值温度为770°C的SiN涂层的Pt/Co盘只能进行102次循环。
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Write/Erase Cyclability of Pt/Co Magneto-Optical Disks
The write/erase cyclability of Co-rich Pt/Co disks was studied, along with factors limiting the cyclability. Annealing experiments suggested that a decrease in CNR results from degradation of the perpendicular magnetic anisotropy in a Pt/Co film heated by an erasing laser beam. The main mechanism of degradation is atomic intermixing at the interface in Pt/Co multilayers. In the case of a Pt/Co film exposed to air, Co might be oxidized during erase cycles. The higher peak temperature of Pt/Co films accelerates the intermixing. Therefore, the number of cycles was increased by adding a heat-diffusive layer to the Pt/Co film in order to lower the peak temperature. For example, Au-coated Pt/Co disks were capable of 10 5 cycles as a result of a lower peak temperature (430°C), whereas SiN-coated Pt/Co disks, with a peak temperature of 770°C, were capable of only 10 2 cycles.
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