Abstract
The thermopower of individual, 30 nm in diameter, Ni nanowires is measured as a functionof bath temperature in the range 4–300 K. Boundary scattering of phonons at low temperatures(<50 K) inhibits any phonon drag effect, that in contrast is observed for bulk Ni. In the diffusion regime(>50 K) the absolute values of the thermopower are found to be smaller than the bulk values.This finding can be explained semi-quantitatively by considering electron scattering atgrain boundaries. Any interpretation of size dependent thermopower in nanoscaleferromagnetic materials needs to explicitly consider the above effects.
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