It has been shown by Westmijze that the process of anhysteretic or ideal magnetization is closely analogous to the ordinary hf biased magnetic recording process. Measurements of the anhysteretic properties of thirteen different tape types have yielded results which can all be fitted to a universal curve. Only two simple magnetic measurements are necessary to adjust the scales of this curve to suit any particular tape. Using a simple expression for the longitudinal field distribution of a ring typ'recording head and the universal curve, numerical integrations have been carried out to determine the bias for maximum output and the recording sensitivity for the above tapes, under long wavelength conditions. Absolute measurements performed on an actual recording machine are in good agreement as far as the values of maximal bias are concerned. In order to account for self demagnetization during the record process a semi-empirical corection to the computed values of recording sensitivity is necessary. The corrected recording sensitivities are in good agreement with the measured values. This paper will describe in detail the equipment, measurements, and curves necessary to determine the performance of magnetic recording tape at long wavelengths.
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