Abstract
Since Hard Disk Drive have became essential to the public in order to storage their massive information, it is in great demand for ultra-high recording density media. The previous disk is one of the products of longitudinal recording media; however, the physical limit had put a constraint on the development of longitudinal one. As a result, it is urgent to investigate a new type of perpendicular recording media and to push them into real products. This study has emphasized on the investigation of CoPtCr-SiO2 perpendicular media. To begin with recording layer deposited on Pt/Ru underlayers, it is the fundamental structure for the optimization of CoPtCr-SiO2 perpendicular recording media. We apply Vibrating Sample Magnetometer (VSM), Perpendicular Magneto-Optical Kerr Effect Meter (PMOKE), X-Ray Diffraction (XRD) to analyze magnetic properties and crystallographic characteristics. In addition, we investigate the micro- structure and composition analysis by Transmission Electron Microscope (TEM) and Energy Dispersive X-ray Spectroscopy (EDS). Next, we introduce two series of buffer-layers to improve magnetic properties and microstructure, as well as the enhancement of segregation examined by curvature measurement. In addition, the effect of Ru working pressure on magnetic and structural properties was investigated with curvature measurement. Finally, we would make the media examined by R&W tests in order to confirm the recording densities and performance for getting into products. As a consequence, the higher SNR performance of our media could promote the recording density to achieve even 100 Gb/in2.