Effects of high magnetic field on the properties of hot-filament CVD diamond films

A hot filament chemical vapor deposition (HFCVD) apparatus, combined with a cyro-cooled superconductor magnet, were recently developed. Nanocrystalline diamond (NCD) films were prepared by above HFCVD apparatus either with or without high magnetic field. Surface morphologies of these films were characterized by means of atomic force microscope (AFM). The results indicated that the mean surface roughness and grain size of these films decreased when the magnetic field varied from 0T to 4T. From Raman scattering measurement, all films prepared either with or without high magnetic field exhibit NCD features. These NCD features of the sample prepared with 4T magnetic field was obviously pronounced. The structure of these films was also investigated by X-ray diffraction (XRD).