钴基合金热处理介质的记录性能

M. Sato;A. Nakaue
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引用次数: 3

摘要

研究了高耐热性碳基钴基合金热处理介质的记录性能。对于具有相同Hc的介质,CoCrTa介质的振幅和介质噪声低于CoNiCr和CoCrPt介质,因为Brδ较低(其中δ是Co基合金层的厚度)。对于具有相同Brδ的CoNiCr介质,介质噪声随着Hc的增加而降低,即随着热处理温度的升高而降低。使用高灵敏度扭矩磁强计和高分辨率扫描透射电子显微镜(HRSTEM)对旋转磁滞损耗的分析表明,随着Hc的增加,Hc/Hkgrain的值增加到0.44,并且CoNiCr晶界处的Cr浓度也增加。因此,人们认为噪声的降低是晶粒之间交换耦合减少的结果。
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Recording Properties of Co-Based Alloy Heat-Treated Media
The recording properties of Co-based alloy heat-treated media using carbon substrates with high heat resistance were investigated. For media with the same H c , the amplitude and media noise of the CoCrTa media were lower than those of CoNiCr and CoCrPt media, because of the lower B r δ (where δ is the thickness of the Co-based alloy layer). For CoNiCr media with the same B r δ, the media noise decreased with increasing H c , that is, with increasing heat treatment temperature. Analyses of the rotational hysteresis loss using a highly sensitive torque magnetometer and high resolution scanning transmission electron microscopy (HRSTEM) showed that the values of H c /H k grain increased to 0.44 with increasing H c , and that the Cr concentration at the grain boundaries of the CoNiCr also increased. It is therefore thought that the reduction in noise was achieved as a result of reduced exchange coupling between grains.
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