An analysis of the frequency response of the magnetic recording process

The Preisach model for magnetic particle interaction in recording tapes is used as a basis for the calculation of the frequency response of the ac biased magnetic recording process. These results are compared with experiment. Since there are numerous other factors present in normal tape recording which affect the frequency response, the tape was spaced away from the recording head; thus, the effect being studied dominates the frequency response. The results indicate that the theory is certainly qualitatively correct. The lack of complete quantitative agreement is attributed primarily to the perpendicular component of the recording field. The theory correctly predicts the change in frequency response with respect to bias current.