Thermally Assisted Magnetic Recording Applying Optical Near Field with Ultra Short-Time Heating

概要

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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.
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