Abstract
Co-CoO films, which are evaporated in the atmosphere of a small amount of O2, have large perpendicular magnetic anisotropy and show excellent read-write (R-W) characteristics. With heat treatment, the microstructure of a film changed and the R-W characteristics were further improved.1,2 This result indicates that the microstructure of a film changed and the R-W characteristics were further improved.1,2 This result indicates that the microstructure of a film closely relates with the R-W characteristics as it does so for Co-Cr films. We measured the spin-echo spectra of a film having various magnetizations to investigate the relationships between R-W characteristics and film microstructure, because NMR is very sensitive to the slight changes of film microstructure.1 A strong absorption was observed at 223 MHz which is for α-Co. The intensity decreased drastically as the amount of oxygen in the films increased and very broad satellites appeared around 250 MHz, implying that Co atoms having a larger magnetic moment than that of α-Co exist for the films containing oxygen atoms. Further, heat treatment increased the absorption intensity at 223 MHz, which means that the internal stress or the lattice defects were removed. The R-W characteristics were found to relate with the absorption intensity. This result shows that the crystallinity of a film greatly influences the R-W characteristics of Co-CoO films.
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