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(Color online) Left: Schematic cross section of the whole patterned structure showing the top/bottom Co electrodes and the 2D assembly of nanoparticles embedded in a thin alumina layer. The circle represents the zone zoomed in the bottom drawing. Right: Cross section of an AFM tapping mode scan of a nanoindent before filling with the Co top electrode. The effective nanocontact cross section is less than .
(Color online) Left: Binarized plane view of self-assembled Au nanoparticles observed by TEM. See Ref. 18 for further information on the binarization process. Right: Size distribution of the same self-assembly. Fitting Gaussian (bold line), parameters are mean diameter and standard deviation.
(Color online) Differential conductance curves at, 190, 120, 60, and for a nominal/ nanocontact. Monte Carlo simulation (plain line) at and with a background charge offset . The other simulation parameters are , , .
(Color online) Top: curve(∎) measured at for the sample shown in Fig. 3 after a change in the background charge. The line is a simulation using the parameters given in the Fig. 3 caption but with . Bottom: curve (∎) obtained from the derivative of the above curve. The line represents the differentiation of the simulation.
Resistance vs magnetic field obtained at and for the sample of Figs. 3 and 4. Inset: same sample at .
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