Extended Data Fig. 2: Characterization of thermal and electrical properties of the scanning thermal probes.

a, Measured electrical resistance of the Pt heater-thermometer as a function of temperature. b, Measured thermal response of the scanning probe as a function of the heating frequency. c, Calibration of the thermal conductance of the probe (input heating power provided to the Pt heater-thermometer plotted against the temperature rise of the probe). The slope of the dashed fitted line corresponds to the thermal conductance of the probe.