N型フェリ磁性記録マークにおける磁束反転の温度制御MFM観察

概要

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Real-space observation of magnetic flux reversal across the magnetic-compensation temperature (T_<comp>) in an N-type ferrimagnet of TbFeCo was achieved by employing a temperature-controllable MFM system (TCMFM). Using a thermally assisted magnetic recording method, we recorded marks on TbFeCo media for MFM measurements performed at various temperatures from 25℃ to 140℃ (T_<comp>〜40℃). The results show a dramatic change in the magnetic flux of the recording marks reflecting the nature of an N-type ferrimagnet. In addition, the temperature dependence of the averaged contrast of the MFM signals coincides with that of the remanent magnetization of the media measured by VSM. Erasing and rewriting of a sub-micron-sized mark by the TCMFM were also demonstrated, indicating that the TCMFM can be a powerful tool for proving the performance of thermally assisted magnetic recording as a means of ultrahigh-density storage.
社団法人日本磁気学会の論文
2006-07-01