Analytical Expressions for Shielded MR Head Response

Hiroaki MURAOKA  Yoshihisa NAKAMURA  

IEICE TRANSACTIONS on Electronics   Vol.E84-C   No.9   pp.1165-1170
Publication Date: 2001/09/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Selected Papers from the 5th Asian Symposium on Information Storage Technology)
shielded MR head,  perpendicular recording,  reciprocity calculation,  

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Recording mechanism of perpendicular recording was examined using analytical expression of shielded AMR/GMR head response. Pulse shape, roll-off performance, and noise spectra were reasonably explained by the calculated head transfer functions. Comparison with the calculation based on the formulae showed several fundamental characteristics of perpendicular recording: no large media noise at low frequencies in magnetic sense, but simply due to a reflection of a head transfer function: no severe resolution degradation: negligible noise power directly arisen from soft magnetic underlayer. This method will provide a convenient design tool for perpendicular magnetic recording.