Test Method for Thermally Assisted Magnetic Recording Applying Surface Plasmon Antennas Stacked on Magnetic Layer

抄録

  We propose a new test method for surface plasmon antennas applied to thermally assisted magnetic recording. Plasmon antennas were directly fabricated on a CoPtCr granular recording medium to maintain a distance between the antennas and the film. This method also makes it possible to prevent the antennas or media from becoming degraded. A silicon nitride dielectric layer was placed between the antennas and the magnetic layer to maintain a precise distance. We chose a thickness of 3 nm for the dielectric layer. Four hundred triangular Au antennas were formed on the medium with an E-beam lithographic technique. The written magnetic domains below the surface of the plasmon antennas were observed by magnetic force microscopy. Therefore, we were able to test the thermal effect of the plasmon antennas by directly placing them on the magnetic film.