Phase dependence of track edge noise in MR head written overlapping tracks

Two dimensional distributions of track edge noise in partially overlapping tracks with various phase relationships were obtained using a time domain correlation technique. An additional read/write channel on the spin stand tester was required to generate an accurate trigger signal for controlling the phase of data tracks. The edge noise associated with the overwriting tracks was found to be dependent on their phases with respect to the overwritten tracks. Low edge noise was obtained when the two tracks are in phase, and high edge noise was obtained when they are out of phase.