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Magnetization manipulation is becoming an indispensable tool for both basicand applied research. Theory predicts two types of ultrafast demagnetizationdynamics classified as type I and type II. In type II materials, a secondslower process takes place after the initial fast drop of magnetization. Inthis letter we investigate this behavior for FePt recording materials withperpendicular anisotropy. The magnetization dynamics have been simulated usinga thermal micromagnetic model based on the Landau-Lifshitz-Bloch equation. Weidentify a transition to type II behavior and relate it to the electrontemperatures reached by the laser heating. This slowing down is a fundamentallimit to reconding speeds in heat assisted reversal.

Speed limit of FePt spin dynamics on femtosecond timescales