Abstract
Nickel-rich Fe–Ni alloy nanoparticles with different compositions were prepared by solution reduction using hydrazine as reductant. The phase composition, morphologies and magnetic properties of as-prepared and annealed samples were characterized by an X-ray diffractionmeter (XRD), a scanning electron microscope (SEM) and a vibrating sample magnetometer (VSM), respectively. XRD results show that all the samples exhibit a single phase with face-centered cubic structure before and after annealing. SEM images show that the as-prepared spherical particles are composed of smaller crystallites. VSM results indicate that the saturation magnetization decreases obviously with the increase of nickel content, while it increases with the annealing temperature. In addition, the samples transform from a half hard magnetic behavior to a typical soft magnetic behavior with the increase of annealing temperature.
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