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(Color online) Schematic diagram of the fabrication process of block copolymer lithography.
(Color online) XRD spectra of the continuous FePt (bottom plot) and continuous FePt/Fe composite (top plot) films before patterning. Both of them show good L10 FePt (001) texture.
The SEM plan-view images of patterned (a) FePt and (b) FePt/Fe composite structure. The diameter of the pillars is about 32 nm, with a size distribution of 8%, and the pitch is about 35 nm.
TEM cross-sectional images of patterned (a) and (c) FePt/Fe composite structure and (b) FePt structure. The thicknesses of the corresponding layers are: CrRu (31 nm), Pt (2.6 nm), FePt (5 nm), Fe (4.9 nm), and Ru (3.6 nm).
(Color online) The hysteresis loops of continuous (a) FePt and (b) FePt/Fe composite media and of patterned (c) FePt and (d) FePt/Fe composite media. The out-of-plane coercivities in these figures are (a) 3.3 kOe, (b) 0.78 kOe, (c) 8.6 kOe, and (d) 4.3 kOe, respectively.
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