Nickel segment-length dependent magnetic properties of Au–Ni–Au nanowires at low temperature fabricated by electrochemical deposition

Segmented wires (Au–Ni–Au) were synthesized by electrochemical deposition. Magnetic study was performed at 6 kOe field applied parallel to the wire long axis at 300 K and 2 K. Coercivity (Hc) and saturation magnetization (Ms) as a function of segment length (l) were constant for longer l (5≤l≤10 μm) at 300 K and 2 K. However, a peak in Hc was observed for l=2.4 μm at 300 K, whereas a decrease in Hc was found for shorter l. Ms followed a decreasing trend with decreasing segment length from 2.4 μm to 200 nm.