PERPENDICULAR MAGNETIC RECORDING PROCESS OF ELECTROLESS-PLATED CONIREP/NIFEP DOUBLE-LAYERED MEDIA WITH RING-TYPE HEADS

被引:13
作者
OSAKA, T [1 ]
HOMMA, T [1 ]
NODA, K [1 ]
WATANABE, T [1 ]
GOTO, F [1 ]
机构
[1] NEC CORP LTD,FUNCT DEVICES RES LABS,KAWASAKI,KANAGAWA 213,JAPAN
关键词
D O I
10.1109/20.278708
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
Electroless-plated CoNiReP/NiFeP double-layered (DL) media with various underlayer coercivity (Hc(u)) were examined to study perpendicular recording performance using ring-type heads. For the case of DL medium with a combination of ring-type heads, it is found that the enhancement of the reproduced voltage by the "phase synchronization (PS) effect[1,2]" is significantly influenced by varying the perpendicular layer thickness (delta-p) and head parameters. In the recording performance using a Mn-Zn ferrite head, the reproduced voltage is drastically enhanced by the PS effect as far as the head field penetrates sufficiently into the bottom of the DL media and magnetizes the underlayer, and the reproduced voltage for the DL medium with He(u) = 160 Oe is higher than that for the DL medium with He(u) = 50 Oe. However, such an effect became obscured with an increase in delta-p, and in turn, the DL medium with lower Hc(u) value demonstrated higher reproduced voltage than that of the DL medium with Hc(u) = 160 Oe, due to the "double layer effect[3,4]" which eminently subjects to the DL media with soft magnetic and quasi-soft magnetic underlayers whose coercivity is lower than several tens of Oe. In the case using a metal-in-gap (MIG) head with Bs = 15 kG, on the other hand, the penetration of the head field was further improved, sufficiently magnetizing the underlayer, and the DL medium with even thicker delta-p (0.3-mu-m) and higher Hc(u) (160 Oe) showed higher reproduced voltage over 240 nVp-p due to the PS effect.
引用
收藏
页码:4963 / 4965
页数:3
相关论文
共 11 条
[1]  
HOMMA T, IN PRESS JPN J APPL
[2]   ON DESIGN OF CO-CR PERPENDICULAR RECORDING MEDIA FOR USAGE OF A RING-TYPE HEAD [J].
IWASAKI, SI ;
OUCHI, K .
IEEE TRANSACTIONS ON MAGNETICS, 1990, 26 (01) :97-99
[3]   PERPENDICULAR RECORDING CHARACTERISTICS AND MICROSTRUCTURE FOR ELECTROLESS PLATED CONIREP FLEXIBLE DISKS WITH A NIMOP UNDERLAYER [J].
MATSUBARA, H ;
MIZUTANI, H ;
MITAMURA, S ;
OSAKA, T ;
GOTO, F .
IEEE TRANSACTIONS ON MAGNETICS, 1988, 24 (06) :3018-3020
[4]   RECORDING CHARACTERISTICS OF ELECTROLESS-PLATED CONIREP FILMS WITH AN INPLANE ANISOTROPIC INITIAL LAYER [J].
MATSUBARA, H ;
MIZUTANI, H ;
MITAMURA, S ;
OSAKA, T .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 1988, 27 (10) :1895-1898
[5]  
MATSUBARA H, 1989, J MAGN SOC JPN, V13, P679
[6]  
MATSUBARA H, 1986, J METAL FINISHING SO, V37, P708
[7]  
MATSUBARA H, 1989, J MAG SOC JPN, V13, P153
[8]  
NASU S, 1989, ANN C MAG SOC JPN, P293
[9]  
OSAKA T, 1987, IEEE T MAGN, V24, P2356
[10]  
OSAKA T, 1991, C ELECTROCHEM SOC JP, P81