OFFTRACK CHARACTERISTICS ON MEDIA NOISE FOR CO-CR-TA FILMS

The effect of remanent magnetic flux density (B-r) and magnetic layer thickness (delta) on offtrack noise characteristics in Co-Cr-Ta alloy thin films is investigated. It has been found that decreasing the valu e of B-r is a more effective method of improving offtrack noise charac teristics than decreasing the value of delta. Offtrack noise is shown to be due to the fluctuations in the amplitude of readback waveforms, fluctuations which are caused by fluctuations in magnetic transition a mplitude. It was observed, using a magnetic force microscope, that low er B-r media had sharp boundaries at the track edge regions and the ma gnetization were more uniform, compared with those of higher B-r media .