MAGNETIC-PROPERTIES OF AMORPHOUS DY-CO FILMS WITH DIFFERENT THICKNESS

The thickness dependence of magnetic properties has been studied in am orphous DyxCo1-x thin films (x = 0.43, 0.49). The compensation tempera ture and coercivity were found to be thickness dependent. In uncoated films with thickness below 800 angstrom, the coercivity and compensati on temperature were found to decrease with thickness and this was attr ibuted to the oxidation of the surface layer of the films. This behavi or was not observed in the thicker films and in SiO-coated films. In t hese films, both the compensation temperature and coercivity do not ch ange with thickness and they depend only on the intrinsic properties.