Structural Change of DLC Film Heated by Laser Irradiation, Analyzed using Surface Enhanced Raman Spectroscopy

Abstract

Heat assisted magnetic recording(HAMR) is suggested as a technique to realize next-generation high-density magnetic recording. The heat resistance of lubrication film and the diamond like carbon (DLC) film of the magnetic disk surface for the laser irradiation is important factor to realize the HAMR. In this study, we focus on the structural change of DLC film on disk surface by laser heating. Then, we observed the Raman spectra using the surface enhanced Raman spectroscopy. As the results, we confirmed that the structural change of DLC film was reduced with the disk rotational speed and it was estimated that the structural change did not occur on the actual rotation speed of HDDs.