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It is assumed that heat-assisted magnetic recording (HAMR) is the recordingtechnique of the future. For pure hard magnetic grains in high density mediawith an average diameter of $5$nm and a height of $10$nm the switchingprobability is not sufficiently high for the use in bit-patterned media. Usinga bilayer structure with 50$\%$ hard magnetic material with low Curietemperature and 50$\%$ soft magnetic material with high Curie temperature toobtain more than 99.2$\%$ switching probability, leads to very large jitter. Wepropose an optimized material composition to reach a switching probability of$P_{\mathrm{switch}}>99.2\%$ and simultaneously achieve the narrow transitionjitter of pure hard magnetic material. Simulations with a continuous laser spotwere performed with the atomistic simulation program VAMPIRE for a singlecylindrical recording grain with a diameter of 5nm and a height of 10nm.Different configurations of soft magnetic material and different amounts ofhard and soft magnetic material were tested and discussed. Within our analysis,a composition with 20$\%$ soft magnetic and $80\%$ hard magnetic materialreaches the best results with a switching probability$P_{\mathrm{switch}}>99.2\%$, an off-track jitter parameter$\sigma_{\mathrm{off},80/20}=14.2$K and a down-track jitter parameter$\sigma_{\mathrm{down},80/20}=0.49$nm.

Noise reduction in heat-assisted magnetic recording by optimizing a high/low Tc bilayer structure