  We present results of magnetic torque calculations using the fully
relativistic spin-polarized Korringa-Kohn-Rostoker approach applied to small Co
and Fe clusters deposited on the Pt(111) surface. From the magnetic torque one
can derive among others the magnetic anisotropy energy (MAE). It was found that
this approach is numerically much more stable and also computationally less
demanding than using the magnetic force theorem that allows to calculate the
MAE directly. Although structural relaxation effects were not included our
results correspond reasonably well to recent experimental data.
