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Shape-controlled synthesis of FeNi 3 nanoparticles by ambient chemical reduction and their magnetic properties

A facile method to control the morphology of FeNi 3 nanoparticles by solution reduction reaction is presented. The spherical to platelet FeNi 3 particles were obtained by changing pH from 11.5 to12.5 with 0.16 mol/L of hydrazine under ultrasound irradiation, with the ratio of Fe 2+ to Ni 2+ as 1:3. The amount of hydrazine had little influence on the morphology of the particles. The saturation magnetization ( M s ) and coercive force ( H c ) of the platelet particles were 59 emu/g and 120 Oe, respectively. The real part μ′ of the permeability of the platelet particles was about 2.43–2.71 and was frequency-independent in the range of 0.1–1.0 GHz. The imaginary part (μ′′) of the particles showed increase from 0.04 to 2.14 within the same frequency range.