Transition and DC noise characteristics of high or media

In this paper, we experimentally investigated DC and transition noise characteristics of media with various OR values. OR was controlled by adjusting the textured NiP surface morphology resulting in different "line density" prior to depositing the same magnetic layered films. The observed results suggested that with increasing OR, DC noise is significantly reduced, while the media transition noise gradually increases. As a result of significant DC noise contribution to the total media noise, the normalized total media noise power of higher OR media is lower over a wide range of recording densities. For high density low M/sup r/t designs, reducing DC noise by increasing OR, inspite of a gain in transition noise, becomes an effective means to increasing areal density.