After publication of this article, we discovered that the two-dimensional (2D) experimental grazing incidence small-angle x-ray scattering (GISAXS) patterns displayed in our original paper were actually reversed along the 2θ f axis. Accordingly, the low-intensity streak corresponding to the steeper slope of the ripples should be located on the positive 2θ f side in our original Figs. 6(a) and 7(a). This does not affect our methodology, and our quantitative results remain valid, except that the asymmetry factor A of the ripples is negative (and not positive as reported in our original Table I). The correct representation of the ripple shape is displayed in Fig. 1(a) of this Erratum where it appears that the as-etched Al 2 O 3 and Si 3 N 4 surfaces present a uniform pattern of asymmetric ripples with γ + < γ − so that the side facing the ion beam is steeper than the opposite side. It is worth noting that both positive 1-4 and negative 5-7 values of A have been reported in the literature.Moreover, taking into account the correct negative sign for δ y in Fig. 1(b) (i.e., in the Al 2 O 3 /Ag/Al 2 O 3 trilayers, the surface roughness of the capping layer replicates the buried ripple pattern with an out-of-phase modulation), we have recalculated the 2D GISAXS patterns presented in our original Figs. 11(c) and 12(c). The corrected results are displayed in Figs. 2(c) and 2(d) of this Erratum, which show a better agreement with the experimental data [Figs. 2(a) and 2(b)] than in the original paper when assuming that the surface roughness of the capping layer replicated the buried ripple pattern with an in-phase modulation. It should be noted that the simulations presented in our original Figs. 11(d) and 12(d) are not affected by the sign of δ y , and thus, they remain valid. γ + γ -Xe + δ y y z H d L x W y Substrate (b) (a) Ag Al O 2 3 χ y z FIG. 1. (Color online) (a) Representation of the shape used to model the form factor of the ripples. The direction of the Xe + ion beam is also indicated. (b) Proposed sketch of the Al 2 O 3 /Ag/Al 2 O 3 trilayers.The surface of the rippled buffer layer is selectively decorated by the nanoparticles on the facets that face the incoming metallic flux indicated by the gray arrow, whereas, the surface roughness of the capping layer replicates the buried ripple pattern with an out-of-phase modulation.
Ultradense macroscopic arrays of ferromagnetic alloy nanowires exhibit unique properties that make them attractive both for basic physics studies and for prospective nanodevice applications in various areas. We report here on the production of self-organized equiatomic FePt nanowires produced by glancing-angle ion-beam codeposition on alumina nanoripple patterns at room temperature and subsequent annealing at 600 °C. This study demonstrates that periodically aligned FePt nanowires with tunable size (∼10-20 nm width and ∼0.5-10 nm height) can be successfully grown as a consequence of shadowing effects and low mobility of Fe and Pt on the rippled alumina surface. Moreover, the structure and magnetic properties of the FePt nanowires, which undergo a phase transition from a disordered A1 (soft) structure to a partially ordered L10 (hard) structure, can be modified upon annealing. We show that this behavior can be further exploited to change the effective uniaxial anisotropy of the system, which is determined by a strong interplay between the shape and magnetocrystalline anisotropies of the nanowires.
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