High Density Thermomagnetic Recording on Flux Detectable RE-TM Media

概要

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Flux-detectable and thermomagnetically recordable media were prepared by sputtering amorphous RE-TM alloys. We investigated the recording characteristics of these media at an ultra-high recording density. A laser-strobe magnetic-field modulation recording scheme was applied to these media in order to form much shorter domains than the diameter of the optical spot. We observed the recorded magnetic domains by magnetic field microscopy and found irregular domains. Domains shorter than 150 nm became collapsed or combined with other domains. To resolve this problem, a heat sink structure was introduced to this media. This structure turned out to be especially effective, and we could record 75-nm-length domains with an Al heat sink layer even if an optical spot with a diameter of 1000 nm was used. The high-density recording capability of these media was confirmed.
社団法人日本磁気学会の論文