The approximate anisotropy field (Han) has been determined for twelve experimental oriented barium ferrite recording tapes and magnets with coercive force (Hc) between 715 Oe and 5250 Oe, and squareness ratio greater than 0.80. The Han values were taken as the ratio of saturation magnetic moment (ms) to the initial hard-axis susceptibility (m/H). Han values were generally within the 12.6–19.8 kOe range predicted by the Stoner-Wohlfarth model, for barium ferrite particles with combined magnetocrystalline and shape anisotropy. The samples with Hc less than 1.7 kOe had an average Han of 12.35 kOe, and the samples with Hc greater than 5 kOe had an average Han of 18.2 kOe. The 6 samples with Hc in the more common 2–5 kOe range had an average Han of 14.5 kOe, but the variation of Han with Hc did not appear to indicate a relationship between Han and Hc.
The nature of the perpendicular recording process at track edges is of interest in the design of very high track density recording systems. Recording experiments carried out on a large-scale model exhibit across-track curvature of the recorded transitions of perpendicular magnetization. Calculations using a simple three-dimensional analytical recording model suggest that the curvature is associated with the across-track variation of the demagnetizing field produced by the recorded magnetization pattern.
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