Near-Field Optical Advanced Hybrid Head Device for Hybrid Recording in and Challenging to Detect Magneto-Optical Information in Near-Field

混合记录是一种很有前途的技术，可以实现超过1 Tbit/inch ^2的记录密度。混合记录涉及使用低于光学衍射极限的小热点和由高Ku材料制成的图案化介质。为了实现高密度，我们提出了一种近场光学先进混合（NOAH）头，它包括一个等离子体天线，作为混合记录的基本设备，我们分析了等离子体天线的形状和材料的时域有限差分（FDTD）模拟，并分析了近场光在等离子体天线和粒子介质之间的共振效应。颗粒介质的光学峰强度高于连续膜。利用聚焦离子束对模拟设计的等离子体天线进行了纳米加工。此外，我们建立了一个静态实验设备的NOAH头，具有红色激光二极管和透镜的数值孔径为0.8。该装置可以控制滑块与介质表面的距离在纳米级。在薄膜沉积后，通过快速热退火合成了L10型FeCuPt相。FeCuPt的居里温度约为200 ℃。在实验中，我们观察到了一个直径约为130 nm的标记，它比780 nm的波长小6倍。在磁场强度为1.5kOe、激光功率为13 mW、激光脉宽为10 μ s的条件下，成功地在FeCuPt薄膜上进行了记录。

Hybrid recording is a promising technology for achieving recording densities in excess of 1 Tbit/inch^2. Hybrid recording involves the use of a small heat spot below the optical diffraction limits and a patterned medium made of a high-Ku material. To achieve a high density, we are proposing a near-field optical advanced hybrid (NOAH) head, which includes a plasmon antenna, as a basic device for hybrid recording.We analyzed the shape and material of the plasmon antenna using a finite-difference time-domain (FDTD) simulation, and analyzed resonant effect of the near-field light between the plasmon antenna and the particle medium by method. The optical peak intensity for the particle medium was higher than that for the continuous film. We nano-fabricated the plasmon antenna designed by the simulation utilizing by focused ion beam (FIB). Furthermore, we built a static experimental equipment for the NOAH head, featuring a red laser diode and a lens with a numerical aperture of 0.8. This equipment could control the distance between the slider and medium surface in nano-metersL1_0-type FeCuPt phase were synthesized by rapidly thermal annealing after deposition of the film. The Curie temperature of the FeCuPt was about200degrees C. It was clarified that Cu-doping was useful for reduction of the Curie temperature of the L1_0-FePt phase.In an experiment using the fabricated NOAH head, we observed a mark with a diameter of around 130 nm, which is 6 times less than the wavelength of 780nm, on the dyed film. Furthermore, we succeeded in recording on the FeCuPt film with the magnetic field of 1.5kOe, the laser power of 13mW, the laser pulse width of 10 us.