Fabrication and Characterization of Exchange Coupled Composite Media
Fabrication and Characterization of Exchange Coupled Composite Media
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DOI：
10.1109/tmag.2006.888233
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发表时间：
2007-01
影响因子：
2.1
通讯作者：
Jianping Wang;W. Shen;Sooyoul Hong
中科院分区：
文献类型：
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作者：
Jianping Wang;W. Shen;Sooyoul Hong
研制了磁性硬、软相CoCrPt-SiO2薄膜，用于制备交换耦合复合材料（ECC）。研究发现，复合晶粒的畴壁形核和从软区向硬区扩展是ECC介质中的切换机制。在软性衬底上制备了ECC介质。CoCrPt-SiO2软层中饱和场和畴壁长对层间厚度的依赖性表明，在ECC介质中畴壁成核和扩展。旋转支架测试表明，饱和写入电流降低了6倍以上，总信噪比（SNR）提高了10 dB以上。读回信号的时间衰减结果表明，ECC介质不存在热稳定性问题。ECC介质的滚降曲线显示出与最先进的参考垂直介质相同的信噪比水平，目标为200 Gb/in2左右。通过进一步优化，ECC介质的面密度似乎可以超过1tb /in2
Magnetic hard and soft phases CoCrPt-SiO2 thin films were developed to fabricate exchange coupled composite (ECC) media. Domain wall nucleation and propagation from the soft regions to the hard regions in the composite grains was found to be the switching mechanism in the ECC media. ECC media on the disk substrate with soft underlayer was fabricated. Interlayer thickness dependence of saturation field and domain wall length in CoCrPt-SiO2 soft layer suggested that domain wall nucleation and propagation in ECC media. Spin-stand testing showed more than a six-times reduction of saturation writing current and more than a 10 dB increase of total signal-to-noise ratio (SNR) for ECC media. Time decay results of readback signals indicated that there is no thermal stability problem for ECC media. The roll-off curve of ECC media showed the same SNR level as a state-of-art reference perpendicular media targeted around 200 Gb/in2. With further optimizations, areal densities beyond 1 Tb/in2 seem achievable for ECC media