Magnetization reversal of single Co/Pd multilayer nanodot by nanoseconds pulse field

Magnetization switching experiments on nanosized [Co(δ_Co 0.3 - 0.8 nm)/Pd (2 nm)]₃ multilayer dots with the diameter of D 240 - 500 nm are carried out using pulse fields with the duration of 1.6 - 10 ns. The switching fields in the nanoseconds regime are significantly enhanced with respect to the values measured by conventional quasistatic magnetometry. The energy barriers are evaluated from the time-dependence of the switching field based on the Néel-Arrhenius law and are found to be proportional to the Co layer thickness.