(a) HRTEM images of the electroless-plated Ni. The microstructure is composed of nanocrystals featuring a diameter of ∼3 nm, as highlighted by dashed circles. Inset demonstrates the diffraction pattern of the main figure. The gray areas in the main figure are the cluster-boundaries. (b) HRTEM image of the electroless-plated CoNi. The microstructure is composed of polycrystals with an average size of ∼5 nm in diameter. Inset demonstrates the diffraction pattern of the main figure.
(Color online) ZFC (open circles)/FC (filled circles, H = 15,000 Oe) data for (a) as-plated Ni-arrays, and (b) CoNi-arrays. The blocking temperature (T B) is around 5 K as shown in (a) main panel. Lower inset shows the M–H curves of the sample at both 10 K and 30 K together with Langevin fittings (solid lines). Details of the fitting are described in Ref. 15.
(Color online) SQUID M–H curves of the CoNi and the as-plated Ni samples. Data were taken at 30 K.
(Color online) XAS (a), and XMCD (b) spectra for the as-plated Ni and the heat-treated Ni sample. XMCD data were normalized to their XAS integration. Inset in (b) shows the M–H curves for the two samples taken at 30 K.
(Color online) (a) Co XAS, and (b) Co XMCD spectra for the CoNi arrays. (c) Ni XAS spectra for the Ni and the CoNi arrays. (d) Ni XMCD spectra for the Ni and the CoNi arrays. All XMCD spectra were normalized to XAS integration.
(Color online) XMCD element-specific M–H curves for (a) Co, and (b) Ni in the CoNi arrays. Data were normalized to Co(Ni)’s TFY intensities.
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