  Magnetization manipulation is becoming an indispensable tool for both basic
and applied research. Theory predicts two types of ultrafast demagnetization
dynamics classified as type I and type II. In type II materials, a second
slower process takes place after the initial fast drop of magnetization. In
this letter we investigate this behavior for FePt recording materials with
perpendicular anisotropy. The magnetization dynamics have been simulated using
a thermal micromagnetic model based on the Landau-Lifshitz-Bloch equation. We
identify a transition to type II behavior and relate it to the electron
temperatures reached by the laser heating. This slowing down is a fundamental
limit to reconding speeds in heat assisted reversal.
