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The linear reversal mechanism in FePt grains ranging from 2.316 nm to 5.404nm has been simulated using atomistic spin dynamics, parametrized fromab-initio calculations. The Curie temperature and the critical temperature(T*), at which the linear reversal mechanism occurs, are observed to decreasewith system size whilst the temperature window T* < T < TC increases. Thereversal paths close to the Curie temperature have been calculated, showingthat for decreasing system size the reversal path becomes more elliptic atlower temperatures, consistent with the decrease in the Curie temperaturearising from finite size effects. Calculations of the minimum pulse durationshow faster switching in small grains and is qualitatively described by theLandau-Lifshitz-Bloch equation with finite size atomistic parameterization,which suggests that multiscale modeling of FePt down to a grain size of ~ 3.5nm is possible.

Switching times of nanoscale FePt: finite size effects on linear reversal mechanism