理工学部の中川活二 教授、塚本新 准教授、伊藤彰義 教授（現 名誉教授）、大貫進一郎 准教授が超高密度情報記録に関する共同研究成果の論文により日本磁気学会の2013論文賞を受賞しました。

本論文は、日本大学と東北大学との共同研究の成果であり、超短パルス光を用いてプラズモンアンテナによる熱アシスト磁気記録を実験とシミュレーションの両立場から実証したものです。

K. Nakagawa, A. Tajiri, K. Tamura, S. Toriumi, Y. Ashizawa, A. Tsukamoto, A. Itoh, Y. Sasaki, S. Saito, M. Takahashi, and S. Ohnuki, "Thermally Assisted Magnetic Recording Applying Optical Near Field with Ultra Short-Time Heating", J. Magn. Soc. Jpn. Vol.37 (2013), pp119-122.　doi:10.3379/msjmag.1302R016

To study thermally assisted magnetic recording focusing on surface plasmon effect as well as thermal diffusion effect, a 90-femto-second laser pulse impinged upon surface plasmon antennas on Co55Pt30Cr15?SiO2 granular film. It is important to use a femto-second laser pulse to analyze those effects, because the effects can be degraded by the thermal diffusion during the laser pulse duration if a longer laser pulse is applied. A SiN dielectric inter-layer was fabricated to keep an accurate distance between the antennas and the granular film. Written magnetic domains caused by surface plasmon effect were clearly observed by a magnetic force microscope. The minimum domain corresponded to 166 nm × 120 nm in size even though the laser spot diameter was about 50 μm. The surface plasmon effect was evaluated by the Finite-Difference Time-Domain method, and the thermal diffusion effect was also calculated to study thermally assisted magnetic recording.

本研究は日本大学N. 研究プロジェクトの支援を受けて実施されています。