Analytical Expressions for Shielded MR Head Response

摘要

Recordign mechanism of perpendicular record - ing 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 frequen - Cies 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.