We investigated the optimized condition of the high remanent magnetization for L10-ordered FePt on MgO/(001) i-GaAs substrate. Perpendicularly magnetized FePt films with different thicknesses of 5 and 10 nm were prepared at a substrate temperature Ts=300 °C by magnetron sputtering. The ratio of remanent magnetization to saturation magnetization for the 5-nm-thick FePt layer was increased to 0.93 by post-annealing at Ta=350 °C for 60 min, whereas that of the 10-nm-thick FePt layer was increased only to 0.3. The uniaxial magnetic anisotropy constant and the degree of long-range order for the 5-nm-thick FePt were Ku=1.0±0.1×107 erg/cm3 and S=0.75±0.15, respectively, which are almost comparable to those of FePt on a (001) MgO substrate.
We report on directed self-assembly of ordered, vapor-deposited gallium nanoparticles on surface-relief-structured polymer substrates. Grating templates impose periodic order in one dimension, most effectively when the grating half-period is of the order of the mean unperturbed center-to-center particle spacing for a given mass-thickness of Ga. Self-organized order also emerges in the perpendicular direction as a consequence of the liquid-phase particles' nucleation, growth, and coalescence on the ridges of the grating pattern in relative isolation from the adjacent slots, and vice versa.
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