Figure 1

(Color online) (a) Electron micrograph of the 145-nm-long permalloy wire. (b) Differential conductance of the 145-nm-long permalloy wire measured at different temperatures. The applied magnetic field was 3 T (except for the lowest trace, here $B=0$). The different traces, except the 800 mK trace, were shifted for clarity. The reproducibility is shown for the 120 mK trace (purple and black trace). The inset shows the differential conductance at 120 mK and 3 T before and after the field was raised to 4 T. The black trace in the inset corresponds to the black trace at 120 mK in the main figure. (c) Magnetoconductance of the 145–nm-long wire in a perpendicular applied magnetic field at different temperatures. Also here, the different traces, except the 800 mK trace, were shifted for clarity. The arrow gives the sweeping direction.Reuse & Permissions

Figure 2

(Color online) Amplitude of conductance fluctuations $d{G}_{\text{rms}}$ measured in the magnetoconductance of the 145-nm-long (black squares) and 330-nm-long wire (red circles). The lines are a guide for the eyes and give a slope of $a=-0.84$. The inset shows the correlation voltage of both wires for different temperatures. Also here black squares correspond to the 145-nm-long wire and red circles to the 330-nm-long wire. The straight line is a guide for the eyes and gives a slope of $a=1$.Reuse & Permissions

Figure 3

(Color online) (a) Change in conductivity $\Delta \sigma$ multiplied with the layer thickness $t$ of the two-dimensional square at zero field (red circles) and $B=6\text{T}$ (black squares) plotted versus $\text{log}T$. The line is the best linear fit of the 6 T data and has a slope of 0.65. The inset shows the magnetoconductance at $T=500\text{mK}$. (b) Conductivity change in a quasi-one-dimensional line array at zero field (red circles) and $B=6\text{T}$ (black squares) plotted versus $1/\sqrt{T}$. The line is the best linear fit of the 6 T data and has a slope of $-2.8\times {10}^8\left(e^2/h\right)\left(\sqrt{\text{K}}/\text{m}\right)$. The inset shows the magnetoconductance at $T=500\text{mK}$.Reuse & Permissions