Newly Developed Linear Signal Analysis and Its Application to the Estimation on Playback Voltage of Narrow Track GMR Heads at an Areal Density of 40 Gb/in2


IEICE TRANSACTIONS on Electronics   Vol.E82-C   No.12   pp.2227-2233
Publication Date: 1999/12/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Information Storage Technologies for the 21st Century)
linear signal analysis,  GMR head,  playback voltage,  pulse width,  domain control magnet,  

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Linear signal analysis (LSA) is the conventional method of estimating the playback voltage and pulse width in linearly operating shielded GMR heads. To improve the accuracy of LSA, a new, highly precise LSA which includes the effect of the magnetization distribution in the medium and inhomogeneous biasing by domain control magnets, was developed. Utilizing this new LSA to calculate the playback waveforms, the calculated peak voltage and pulse width were compared with the experimental values and agreement within 10% was obtained. As the result of estimation using the new LSA, it is considered that the use of a vertical-type spin-valve head will make it possible to achieve a recording areal density of 40 Gb/in2.