We have measured the electrical resistivity of a single strand of a
ferromagnetic Ni nanowire of diameter 55 nm using a 4-probe method in the
temperature range 3 K-300 K. The wire used is chemically pure and is a high
quality oriented single crystalline sample in which the temperature independent
residual resistivity is determined predominantly by surface scattering. Precise
evaluation of the temperature dependent resistivity (ρ) allowed us to
identify quantitatively the electron-phonon contribution (characterized by a
Debye temperature θR) as well as the spin-wave contribution which is
significantly suppressed upon size reduction