Effect of Trackwidth and Linear Spacing on Stability and Noise in Longitudinal and Perpendicular Recording

Abstract

Results from spin-stand and MFM experiments showing the effect of demagnetizing fields for both perpendicular and longitudinal media are presented. Spin-stand experiments involved measurement of the current required to erase square wave recordings to half amplitude. While longitudinal media require smaller currents to erase higher density recordings, perpendicular media require higher currents. MFM studies indicate differences in the onset of the magnetization reversal. The reversal initiates near the transition in longitudinal media but further from the transition in perpendicular media. Experimental results showing an increase in transition jitter with decreasing trackwidths are also reported for both longitudinal and perpendicular media.