Influence of the (111) twinning on the formation of diamond cubic/diamond hexagonal heterostructures in Cucatalyzed Si nanowires Incoherent structural relaxation of fivefold twinned nanowires Appl. Phys. Lett. 93, 043101 (2008); 10.1063/1.2963352Low-temperature synthesis of silica-enhanced gallium nitride nanowires on silicon substrate
The deformation of ‘soft’ polystyrene spheres is found to limit the usefulness of nanosphere
lithography in high-density applications because of the eventual closure of the void areas
between the self-assembled nanospheres which function as channels for material
deposition. We have used a plasma etching technique to reopen and enlarge these
channels in the template in a controlled manner. This enables the controlled
fabrication of a range of nanoarrays of very high density and variable sizes. The
resulting shape of the nanodots produced can be understood by considering the
etching-induced surface diffusion of the polystyrene in the plasma treatment.
As-deposited ͑Fe, FePt, FePtCu͒-C nanocomposite films with fixed C atomic fraction x c =47 fabricated using facing-target sputtering method at room temperature are composed of ϳ2 -3-nm amorphous metal granules buried in a-C matrix. Annealing at high temperatures turns the amorphous granules into ␣-Fe, ␣-Feand L1 0 -structured FePt, and L1 0 -ordered FePtCu for Fe-C, FePt-C, and FePtCu-C films, respectively, and makes a-C preferential graphitization. As-deposited granules are superparamagnetic at 300 K, and ferromagnetic at 5 K. The zero-field-cooled ͑ZFC͒ and field-cooled ͑FC͒ curves reveal that there exist strong intergranular interactions at temperatures below 300 K, and the size distribution of granules becomes broad by Pt and Cu addition. The M-H loop of annealed Fe 31 Pt 22 C 47 films exhibits a two-step saturation behavior because of the coexistence of soft and hard ferromagnetic phases. As the Cu atomic fraction is 14%, the coercivity of annealed Fe 23 Pt 16 Cu 14 C 47 films reaches a large value of ϳ11.2 kOe at 5 K and decreases to ϳ7.2 kOe at 300 K.
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