Magnetization behavior of NiMnGa alloy nanowires prepared by DC electrodeposition

Abstract NiMnGa have potential applications for magnetic field sensors, strain sensors, actuators and solid-state refrigeration, due to their unique microstructures and crystalline phases at various temperatures. Synthesis of Heusler type NiMnGa nanowires (diameter ~200 nm) has been done by low cost DC electrodeposition method using AAO templates. This method was employed due to its cost effectiveness, simplicity, and precise control over composition, diameter and length of nanotubes/nanowires. It has been observed that Ga concentration decreases as Mn concentration increases with the rise in potential. Magnetic properties have been studied at room temperature as well as at low temperatures. It has been found that coercivity (Hc) increases as temperature decreases. The nanowires have maintained ferromagnetic behavior from 10 K to RT.