Title :
Magnetic properties and structure of (Co-alloy)-SiO2 granular films
Author :
Kaitsu, I. ; Inomata, A. ; Okamoto, I. ; Shinohara, M.
Author_Institution :
File Memory Lab., Fujitsu Labs. Ltd., Atsugi, Japan
fDate :
9/1/1996 12:00:00 AM
Abstract :
We fabricated (Co-alloy)-SiO2 granular films by rf-sputtering with composite target and annealing in a high vacuum environment. The coercivity of the films depended on annealing temperature, the Co-alloy´s volume fraction in the film, and other added elements to cobalt. We found that a (Co85Pt15)83-(SiO2)17 granular film (Co85Pt15: 64 vol.%) exhibited about 1600 Oe of coercivity at room temperature. The grains diameter was about 50 nm measured by AFM. X-ray diffraction patterns showed that the Co-alloy grains of most films had an fcc-phase structure. From Henkel-plot analysis, the magnetic exchange interaction between the CoPt grains was found to be weak
Keywords :
annealing; cobalt alloys; coercive force; exchange interactions (electron); granular materials; magnetic thin films; platinum alloys; silicon compounds; sputtered coatings; (Co-alloy)-SiO2 granular film; (Co85Pt15)83-(SiO2) 17; AFM; FCC phase; Henkel-plot analysis; RF sputtering; X-ray diffraction; annealing; coercivity; exchange interaction; grain size; magnetic properties; structure; Annealing; Coercive force; Magnetic anisotropy; Magnetic films; Magnetic materials; Magnetic properties; Magnetic recording; Perpendicular magnetic anisotropy; Saturation magnetization; Temperature dependence;
Journal_Title :
Magnetics, IEEE Transactions on
