Fabrication and characterization of spherical Co/Ni alloy particles

Spherical ferromagnetic Co/Ni alloy particles have been synthesized via a polyol process assisted by solvothermal treatment. XRD, EDX and SEM analyses have shown that the equal molar Ni(CH3COO)2·4H2O and Co(CH3COO)2·4H2O were reduced by ethylene glycol at 200 °C, resulting in the formation of Co50Ni50 alloy particles with a narrow particle size ranging from 200 nm to 500 nm. Magnetic properties of the sample at room temperature were measured using a vibrating sample magnetometer. The saturation magnetization and coercivity of the Co/Ni particles exhibit 123.21 emu/g and 108.23 Oe, respectively, which indicates that the alloy is ferromagnetic at room temperature.