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Hot-spot detection and calibration of a scanning thermal probe with a noise thermometry gold wire sample
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) SEM image of the thermal scanning probe. (b) SEM image of the active region of the tip. The Au layer does not cover the entire tip, but is mostly concentrated in the active area. The tip has a radius of curvature between 50 nm and 500 nm.

Image of FIG. 2.
FIG. 2.

SEM image of the calibration sample, which consists of 2 parallel gold wires that are 400 μm long, 1 μm wide, and 15 nm thick.

Image of FIG. 3.
FIG. 3.

Schematic of the experimental setup for noise thermometry measurements.

Image of FIG. 4.
FIG. 4.

Average excess white noise power density vs. I2. The experimental data (points) are linear, and a fit (line) gives a slope of 3.53−14 V2/A2 Hz1/2. At 4.5 mA, the increase in temperature is 16.3 K.

Image of FIG. 5.
FIG. 5.

(a) A two-dimensional XY plot of the scanning thermal probe's resistance change over the wire with ΔT of 1.6 K. (b) The plot of the measured peak height, ΔR, as a function of bias currents squared applied at the wire shows that the probe signal is due to the excess temperature of the wire. Inset: Line scan of the probe over the gold wire at ΔTwire  = 1.6 K, corresponding to ΔRprobe  = 0.03 Ω. The probe is scanned perpendicular to the wire.

Image of FIG. 6.
FIG. 6.

Cross-sectional temperature distribution of a 600-nm radius tip.

Image of FIG. 7.
FIG. 7.

A plot of the surface temperature of the metal element versus distance X along the horizontal axis from the contact point for the three values of tip radii: 100 nm, 300 nm, and 700 nm.

Image of FIG. 8.
FIG. 8.

Temperature conversion factor, η, versus tip radius for two different thermal probe patterns.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hot-spot detection and calibration of a scanning thermal probe with a noise thermometry gold wire sample