Figure 3
From: Room temperature in-situ measurement of the spin voltage of a BiSbTe3 thin film
Results of the spin voltage measurement in two tip configurations. The spin-sensitive four-point resistance is measured as function of distance between the inner voltage-probing tips. The tip configuration is depicted in the insets, respectively. For the sake of comparison between the sets of measurements with slightly different s12 and s24, the resistance is plotted versus a dimensionless inter-tip distance χ. (a) Measurement results obtained in the symmetric configuration (s12 ≈ s24 ≈ 3.5 μm). Data points in red and blue correspond to measurements with opposite magnetisation directions of the FM tip, while data points coloured in green were obtained with only NM tips, providing a control experiment. (b) In the high current density configuration, the FM tip is positioned close to a current-injecting tip (s12 ≈ 0.4 μm, s24 ≈ 7 μm). Red and blue/cyan data points denote resistances acquired with reversed magnetic polarisation directions of the FM tip, respectively. The lines of corresponding colour represent fits of the resistance model (Eq. 4).
