Fabrication and temperature-dependent magnetic properties of one-dimensional multilayer Au-Ni-Au-Ni-Au nanowires

초록

Multilayer Au-Ni-Au-Ni-Au nanowires with a controlled diameter of 100 nm were synthesized by electrochemical deposition in porous alumina templates. The length of each Ni-segment was controlled up to similar to 230 nm, while the length of the Au segment sandwiched between two Ni segments was similar to 180 nm. X-ray diffraction patterns and energy-dispersive X-ray spectra confirmed the formation of purely crystalline nanowires. The magnetic properties of the multilayer Au-Ni-Au-Ni-Au nanowires were investigated in the temperature range 2-300 K. Room-temperature magnetic hysteresis confirmed the ferromagnetic nature of the nanowires. The plot of coercivity as a function of temperature (from 2 to 300 K) followed law applicable for ferromagnetic nanostructures. The magnetization tended to increase as the temperature decreased, following the modified Bloch's law similar to ferromagnetic nanoparticles. (C) 2013 Elsevier Inc. All rights reserved.

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