平滑な下地膜を有する光磁気記録媒体における記録ノイズ低減とその磁気特性

概要

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A smoothed underlayer surface produces a low level of disk noise in unrecorded disks and a high level of recording noise generated by recording marks. To achieve high S/N disks, the recording noise must be suppressed. By investigating the domain wall motion, we examined the origin of the high recording noise and studied ways of reducing it. When a flat underlayer was used, we found that the high recording noise was caused by irregular domain shapes that resulted from the decrease in the number of domain-wall-pinning sites. A possible cause of the irregular domain shapes is the smaller coercivity of Fe-rich disks and the larger contracting force acting on the domain wall in Tb-rich disks. When we deposited an improved TbFeCo film at a higher Ar pressure in order to create more wall-pinning sites, the recording noise was suppressed at about 4 dB in TM-rich disks, while the disk noise remained low.
社団法人日本磁気学会の論文