Thermopower measurement of single isolated metallic nanostructures

Abstract

A method was developed to determine the absolute thermopower coefficient of metallic wires without ensuring a preset temperature gradient. The temperature gradient is determined by a lock-in detection of the voltage caused by the simultaneous flows of an AC heat current and a DC electric current through the wire. This technique gives access to the thermopower of nanostructures. It is illustrated with measurements from room temperature down to 15 K of Ni nanowires made by template synthesis. Data are discussed with regards to temperature calibration issues, the frequency limit and accuracy.

Magnetotransport properties depending on the nanostructure of Fe3O4nanowires

“…During the electrodeposition procedure, a single contact was made between two gold layers sputtered on both sides of the membranes. The resistance of the contacted nanowire was measured in a magnetic field of −8 kOe < H < 8 kOe and in the temperature range of 70-300 K. High-precision thermoelectric power measurements by lock-in amplifier detection were carried out using a laser beam as an oscillatory source [11]. figure 1(c)) and of 60 nm ( figure 1(d)).…”

Time-resolved measurement of the tunnel magneto-Seebeck effect in a single magnetic tunnel junction

“…The setup used in this work is based on the experiments performed by Gravier et al 25 on metallic nanowires. We adapted the electrical and optical techniques to the requirements for measuring small thermovoltages across a micrometer-sized single MTJ.…”

Quantitative Determination of Contributions to the Thermoelectric Power Factor in Si Nanostructures

“…During the measurement, the temperature difference 4T induced across the nanoribbon is typically below 2 K, and the thermoelectric voltage is measured using a nanovoltmeter with input impedance exceeding 10 G . The contribution from the nickel electrodes [30] is subtracted from the results, and it is less than 5% of the total thermopower in all cases.…”