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Multi-level magnetic recording is a new concept for increasing the datastorage capacity of hard disk drives. However, its implementation has beenlimited by a lack of suitable media capable of storing information at multiplelevels. Herein, we overcome this problem by developing dual FePt-C nanogranularfilms separated by a Ru-C breaking layer with a cubic crystal structure. TheFePt grains in the bottom and top layers of the developed media exhibiteddifferent effective magnetocrystalline anisotropies and Curie temperatures. Theformer is realized by different degrees of ordering in the L10-FePt grains,whereas the latter was attributed to the diffusion of Ru, thereby enablingseparate magnetic recordings at each layer under different magnetic fields andtemperatures. Furthermore, the magnetic measurements and heat-assisted magneticrecording simulations showed that these media enabled 3-level recording andcould potentially be extended to 4-level recording, as the up-down and down-upstates exhibited non-zero magnetization.

Multi-level recording in dual-layer FePt-C granular film for heat-assisted magnetic recording