Title :
5 Gb/in2 recording demonstration with NiFe/Co90 Fe10 spin-valve heads and low-noise thin-film disks
Author :
Mutoh, H. ; Kanai, H. ; Okamoto, I. ; Ohtsuka, Y. ; Sugawara, T. ; Koshikawa, J. ; Toda, J. ; Uematsu, Y. ; Shinohara, M. ; Mizoshita, Y.
Author_Institution :
HDD Dev. Div., Fujitsu Labs. Ltd., Kanagawa, Japan
fDate :
9/1/1996 12:00:00 AM
Abstract :
A high areal density of 5 Gb/in2 (7.75 Mbit/mm2 ) has been demonstrated with narrow track NiFe/Co90Fe 10 spin-valve read heads on low-noise CoCrTaPt/CrMo-alloy thin-film disks. The MFM measurements clearly showed the write track width to be 1.2 μm on the CoCr17Pt5Ta4 thin-film media. This corresponds to 19.5 kTPI (768 track/mm) including a guard band of 0.1 μm. The error rate performance was tested using a PR4ML channel with write precompensation. At a data rate of 33 MB/s, a practical error rate of 9.0×10-6 was obtained without error correction at a linear density as high as 257 kBPI (10.1 kbit/mm). At a linear density of 217 kBPI (8.5 kbit/mm), we obtained an error rate of less than 10-8 without error correction. With a 192-bit Reed-Solomon error correcting code, we can expected an error rate of 1.0×10-14
Keywords :
cobalt alloys; iron alloys; magnetic disc storage; magnetic force microscopy; magnetic heads; magnetic recording noise; magnetic thin film devices; nickel alloys; 1.2 micron; 3.3 MB/s; CoCrTaPt-CrMo; MFM; NiFe-Co90Fe10; NiFe/Co90Fe10 spin-valve head; PR4ML channel; Reed-Solomon error correcting code; areal density; data rate; error rate; linear density; low-noise CoCrTaPt/CrMo-alloy thin-film disk; narrow track recording; write precompensation; write track width; Disk drives; Error analysis; Error correction; Iron; Magnetic films; Magnetic heads; Magnetic recording; Magnetic shielding; Magnetosphere; Transversal filters;
Journal_Title :
Magnetics, IEEE Transactions on
