Relationship Between Hk Distribution of Media and High Density Recording Characteristics

A new parameter, the ΔH_C of minor M-H curves, is introduced in order to estimate the standard deviation of the H_k distribution. AHC correlates strongly to the coercivity squareness S* and the half-maximum width of the switching field distribution SFD, and need not be compensated for the demagnetizing field in perpendicular recording media. It was shown by computer simulation analysis that the magnetic recording performance depends greatly upon the particle's anisotropy field H_k distribution in the recording medium, as well as the coercivity and saturation magnetization. The narrow H_k distribution of Co-Cr sputtered media derives from the high crystallinity, and leads to superior performance in high density recording.