Grain density control in FePt granular films for heat-assisted magnetic recording media

Abstract To realize high areal density, hard disk drives larger than 4 Tbit in −2 , ultrafine FePt grains of less 5 nm and grain density 24 T are required. Although there have been many investigations to reduce the size FePt, only a few reports on control density. increase we focused three aspects surface morphology density: nucleation sites substrate surface, free energy, lattice mismatch. We achieved 14 by maximizing number FePt-C granular film found that energy mismatch crucial parameters for controlling