Abstract
The dependencies of reproduced outputs on headto-medium spacings in perpendicular magnetic recording have been analyzed by computer simulation and compared with the equivalent dependencies in longitudinal magnetic recording. In the recording process, the spacing loss coefficient has little dependence on the bit lengths, because the recording field gradient of an SPT head is not significantly changed by a change in spacing. On the other hand, the spacing loss coefficients in the reproduction process change and become larger as the bit length becomes longer. This is because the reproduce sensitivity function of an SPT head is changed by the strength of head-medium magnetic coupling, which depends on the head-medium spacing.
