光磁気ディスクの記録感度と寿命

概要

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The lifetime estimate of a magneto-optical disk which has GdTbFe for the magnetic layer, AlN for dielectric layers, and AI for the reflective layer was discussed. In order to study the aging characteristics, accelerated aging tests were performed by changing the ambient temperature (20∼100°C in air). In addition to the coercivity, recording sensitivity which was evaluated with recorded bit length was chosen as the basis on which the lifetime was estimated quantitatively.As the aging time grew longer, the recording sensitivity tended to decrease. The higher the aging temperature, the larger the decrease rate was. Using the Arrhenius method, the magneto-optical disk with the quadri-layer structure mentioned has an expectant lifetime of about 18 years, which is long enough for optical data storage application.
社団法人日本磁気学会の論文