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The read spacing losses in perpendicular magnetic recording have been investigated experimentally for various combinations of heads and media. The spacing loss coefficient, K, which is the slope when the spacing loss is plotted versus d/λ, has been measured for sinusoidal magnetization. The results show that for a single layer medium, K is almost the same as that in longitudinal recording, and that for a double layer medium, the K value is large at long wavelengths and becomes small with decreasing wavelength to the value less than 54.6. Particularly for a ring head, a striking wavelength dependence of K is observed. Such a wavelength dependence results from the change of the distribution and the magnitude of the head sensitivity function with spacing. Nevertheless in digital recording, the deterioration in recording density characteristics with increasing spacing is small, even at low densities, because of the contribution of harmonics in output singnals

Read spacing loss in perpendicular magnetic recording.