Structural and magnetic properties of nanocrystalline nickel-rich Fe-Ni alloy powders prepared via hydrazine reduction

► Nanostructured Fe-Ni alloys are successfully prepared via hydrazine reduction. ► The prepared alloys are spherical particles composed of primary crystallites. ► The as-prepared samples show a half hard magnetic behavior. ► The prepared alloys transform to a soft magnetic behavior after annealing.