Micromagnetic modeling and experimental study of transition noise correlation in thin-film media

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Abstract
Micromagnetic modeling and time‐domain experimental measurements are combined to study spatial noise correlations between two closely recorded transitions in oriented longitudinal thin‐film media. The Karhunen–Loeve expansion method is utilized to characterize the noise correlations. The analysis shows that the noise correlation of the dipulses exhibits three principle modes: amplitude variation, shift in unison, and breathing. The supralinear increase of noise at small bit intervals in well‐oriented longitudinal film media is dominated by the amplitude variation, which arises from large variation of the degree of percolation between adjacent transition boundaries. The results from the micromagnetic modeling shows excellent agreement with the results obtained from the experimental time‐domain noise measurements.