Low noise properties and thermal stability of Co-based thin film media for high density longitudinal recording

被引:6
作者
Abarra, EN [1 ]
Okamoto, I [1 ]
Sato, K [1 ]
Yoshida, Y [1 ]
Akimoto, H [1 ]
Uematsu, Y [1 ]
机构
[1] Fujitsu Ltd, File Mem Lab, Atsugi, Kanagawa 2430197, Japan
关键词
longitudinal magnetic recording media; low noise properties; thermal stability; 20 Gbit/in(2) recording;
D O I
10.1109/20.824430
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Media with excellent signal to noise properties and adequate high temperature thermal stability have been developed for over 20 Gbit/in(2) recording. The media are fabricated by de magnetron sputtering onto textured NiP films on AI-Mg substrates, The magnetic layer is a CoCr-based quaternary alloy with (11.0) preferred orientation on a Cr alloy (002) underlayer, The average grain diameter has been reduced to an average of < 10 nm, TEM-EDX studies revealed that Cr segregation has been enhanced compared to a previous CoCrPtTa media used for 15 Gbit/in(2) recording resulting in improved Co to Cr core composition and increased grain boundary Cr content. Spinstand measurements of the thermal decay after annealing at 65 degrees C indicate sufficient thermal stability at 400 kfci for media with Mr delta > 0.3 memu/cm(2) consistent with magnetometry measurements.
引用
收藏
页码:86 / 91
页数:6
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