EFFECT OF GRAIN ISOLATION ON MEDIA NOISE IN THIN-FILM LONGITUDINAL MEDIA

被引:26
作者
RANJAN, R [1 ]
CHRISTNER, JA [1 ]
RAVIPATI, DP [1 ]
机构
[1] DIGITAL EQUIPMENT CORP, PHOENIX, AZ USA
关键词
21;
D O I
10.1109/20.50561
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
Particulate media exhibit low media noise as compared to thin-film longitudinal media. The main source of media noise in thin-film longitudinal media is the zig-zag transitions which occur due to a strong magnetic coupling between neighboring grains. Thus if the grains in thin-film longitudinal media can be isolated, the media noise should be decreased. In order to alter the magnetic coupling across grain boundaries, CoNiCr/Cr films of different microstructure were prepared by changing the Cr underlayer microstructure [1], [2]. SEM analysis indicates that the grain structure of these media ranged from continuous to isolated grains. VSM results show that both S and S* decrease as the grain isolation increases. The media noise of the disk with continuous grains increases linearly with frequency, reaches a maximum, and eventually decreases and has been explained by Belk et al. [3]. However, the media noise for isolated grain media is weakly dependent on the recording frequency—more like a particulate media. The interrelation between microstructure, magnetic, and recording results are discussed. © 1990 IEEE
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页码:322 / 327
页数:6
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