Jitter noise reduction by improving grain uniformity in granular media

The relationship between jitter noise and the magnetic microstructure of recording media was investigated with Voronoi modeling. To maintain thermal stability, the average grain size was assumed to be constant. Two microstructural irregularities were investigated quantitatively: Grain size deviation and grain location deviation. By improving both grain uniformities, the jitter noise was significantly reduced. Even a slight improvement in the grain size and location deviations brings an effective reduction in jitter noise. Grain growth control during granular media fabrication will improve the jitter noise and, therefore, enable high areal density recording.