SIMULATION OF THE RECORDING PROCESS ON CO-CR LAYERS WITH A VSM

To investigate the role of both perpendicular and in-plane head field components in the recording process we simulated a ring head writing a transition in Co-Cr layers with our VSM by changing the field strength and rotating the sample simultaneously. Both the magnetisation components parallel and perpendicular to the field direction are measured. An increase in perpendicular magnetisation, which can be larger than 50% at the centre of the transition, and a decrease in in-plane magnetisation are found in case the head field is switched compared to the case where the head field is not switched. These effects decrease with increasing maximum field values and with decreasing effective perpendicular anisotropy of the layer. In the experiments the in-plane field component appears to play an important role: without this component these effects are not observed. The results are consistent with recording experiments with ring heads and prove that the extra minima in the frequency response described in an earlier paper have a micromagnetic origin. © 1990 IEEE