The FeNi nanoparticles were reduction-prepared from the Fe and Ni salts by hydrazine hydrate

under the conditions of ultrasonic

mechanical stirring and microwave

respectively.The X-ray diffraction（XRD）verified that the crystalline structure of FeNi alloy occurred in the reaction products.Meanwhile

the results of energy-dispersive X-ray spectrum（EDS） showed that Fe/Ni molar ratios in the FeNi nanoparticles were approximately in accordance with the initial feeding molar ratios.The images of scanning electron microscopy（SEM） showed that all the FeNi nanoparticles prepared under ultrasonic were spherical and their diameters located in the range of 50-120 nm

whereas the condition of mechanical stirring produced the FeNi nanospheres of 100 nm covered with a papillary structure while the microwave radiation resulted in monodisperse FeNi nanocubes.Consequently

the morphologies and sizes of the FeNi nanoparticles might be controlled by controlling the reaction conditions and the feeding molar ratio.At last

the magnetic properties of all the FeNi nanoparticles were measured

and all the FeNi nanoparticles showed a good character of soft-magnetic materials.The FeNi nanoparticles prepared from equivalent Fe/Ni feeding molar ratio under mechanical stirring showed the maximum magnetization

and reached 92.68 A·m2/kg.