Title :
Large coercivity and granular structure of CoPt/SiO2 films
Author :
Chen, Chen ; Kitakami, Osamu ; Okamoto, Satoshi ; Shimada, Yutaka ; Shibata, Kichiro ; Tanaka, Michiyoshi
Author_Institution :
Res. Inst. for Sci. Meas., Tohoku Univ., Sendai, Japan
fDate :
9/1/1999 12:00:00 AM
Abstract :
By post-annealing the as-prepared CoPt/SiO2 samples with the atomic ratio of Co: Pt=47.5: 52.5, high coercivity Hc≈14 kOe was obtained at room temperature. TEM and XRD revealed the ordered fct (L10) structure with the lattice constant ratio c/a=0.97 in the granular films with the average grain size around 10-20 nm. The grain size and packing density effect on coercivity are also discussed
Keywords :
X-ray diffraction; annealing; cobalt alloys; coercive force; discontinuous metallic thin films; ferromagnetic materials; grain size; magnetic thin films; platinum alloys; silicon compounds; transmission electron microscopy; CoPt; CoPt/SiO2 films; SiO2; TEM; XRD; grain size; granular films; granular structure; large coercivity; lattice constant ratio; ordered fct (L10) structure; packing density; post-annealing; Annealing; Atomic measurements; Coercive force; Grain size; Magnetic anisotropy; Magnetic films; Magnetic recording; Saturation magnetization; Substrates; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
