抄録
Reduction of medium noise is the key in perpendicular magnetic recording. The CGC medium that has a layered continuous and granular films is a candidate for obtaining a high SNR. We investigated noise characteristics of the CGC double-layered medium by focusing on transition jitter and magnetization transition analysis with an MFM. Results show that the transition smoothing by depositing the continuous layer was confirmed by both waveform analysis and MFM image analysis. The effect is due to magnetic interaction between the continuous layer and granular layer that resolves exchange-coupled clusters existing in a sole granular layer. Less transition noise, and therefor better SNR, resulted.
