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The limits of the areal storage density as can be achieved with heat assistedmagnetic recording (HAMR) are still an open issue. We want to address thiscentral question and present the design of a possible bit patterned medium withan areal storage density above 10 Tb/in$^2$. The model uses hard magneticrecording grains with 5 nm diameter and 10 nm height. It assumes a realisticdistribution of the Curie temperature of the underlying material as well as arealistic distribution of the grain size and the grain position. In order tocompute the areal density we analyze the detailed switching behavior of arecording bit under different external conditions, which allows to compute thebit error rate of a recording process (shingled and conventional) for differentgrain spacings and write head positions. Hence, we are able to optimize theareal density of the presented medium.

Heat assisted magnetic recording of bit patterned media beyond 10 Tb/in$^2$