Generalized delta m curves for particulate recording media obtained by Fourier analysis

The generalized delta m(a) curve obtained by the Fourier analysis of the fi rst magnetization and major hysteresis loop is analyzed within the frame of a generalized moving Preisach model. Analytical expressions of the Fourier coefficients are obtained when the mean held interactions are negligible. Experimental and simulated delta m and delta m(a) curves are obtained for c ommercial particulate recording tapes. The condition is established for usi ng the generalized curves instead of the classical ones in particulate medi a.