Output Waveforms from Printed and Head-Recorded Media

First, the relation between MFM output and head output waveforms from perpendicular magnetic printed media was clarified. Next, the MFM output waveforms from magnetically printed and head-recorded media were compared by using metal-evaporated (ME) tape as a slave medium. The MFM output waveform corresponds very closely with the head output waveform, and it appears that the MFM output is similar to the perpendicular component of the stray field. In the case of a long bit length, the bit-printing (BP) waveform is similar to the head-recording (HR) waveform, while the edge-printing (EP) waveform is significantly different from the HR waveform. On the other hand, in the case of a short bit length, the BP, EP, and HR waveforms are all sinusoidal, but the phase of the EP waveform is 90° shifted from the HR waveform, while the BP waveform is almost identical to the HR waveform.