Finite-size effects in nickel nanowire arrays

Nickel nanowire arrays with diameters in the range 30–500 nm have been fabricated by electrochemical deposition into nanoporous, single-crystal mica templates, which allow measurements of the magnetic properties of nickel nanowire arrays at high temperatures. The Curie temperature is found to be reduced by as much as 51 K for the 30 nm diameter nanowires. The Curie temperature shift with wire diameter follows the finite-size scaling relation with $\lambda =0.94\mathrm{}$ and ${\xi }_0=22\mathrm{}\AA .$