The effect of remanence in digital recording

A subject of great theoretical and experimental interest in digital recording in recent years has been the correlation between recording behavior and the magnetic properties of the recording media. Several isolated ranges of variation of media parameters have been explored with somewhat diverse results. The intent of this communication is to provide a comprehensive view over the entire range of the technologically interesting values of the media parameters, through a theoretical simulation of the recording process based on harmonic analysis. The remanent induction was the primary variable in this study, ranging from 500-18 000 gauss, while the coercivity and thickness were varied as parameters in the range 50-800 Oe and5-1250 × 10⁻⁸m, respectively. The results were fitted to a hyperplane of the formPW₅₀ = CHcα₁Bᵣα₂tα₃. For small thickness (t ≤ 50 × 10⁻⁸m) we foundα₁ = -0.287 , α = 0.272, α₃ = 0.290. For large thickness (t > 100 × 10⁻⁸m) we foundα₁ = -0.277, α₂ = 0.260,α₃ = 0.470with the change in α3attributed to an effective spacing loss.