| Popis: |
The magnetic and structural properties of Co x Pt 100− x films with x =40,45 and 50 at%, have been investigated. The magnetic studies were focused on the dependence of magnetic hysteresis on the film thickness. The sample thicknesses varied between 10 and 200 nm. The coercivities of the as-grown, disordered fcc structure films did not change very much with thickness for all compositions studied. Upon annealing at 650 and 700°C, a structural transformation takes place to the ordered face centered tetragonal (fct) phase which has a high anisotropy resulting in large coercivities that show a pronounced thickness dependence for all the compositions studied. |
