Fig. 4: Electrical resistivity.

a, b The height images and surface electric potential of FeSiAl:Sn-0.8 SMC. c Electrical resistivity of FeSiAl:Sn-0 and FeSiAl:Sn-0.8 particles after annealing. d, e The height images and surface current of FeSiAl particle in FeSiAl:Sn-0 SMC. f The corresponding current profile along the red arrow in e. g, h Height image and current map of FeSiAl:Sn particle in FeSiAl:Sn-0.8 SMC. i The corresponding current profile along the red arrow in h. Source data are provided as a Source Data file.