High-frequency magnetic properties of FeNi3–SiO2 nanocomposite synthesized by a facile chemical method

Monodisperse core–shell structured FeNi3–SiO2 composite nanoparticles (NPs) were synthesized by a facile hydrazine reduction combined modified Stöber method. SEM and TEM analysis shows that FeNi3 cores are composed of small primary nanocrystals and are coated by amorphous SiO2 layer. As-prepared FeNi3–SiO2 nanocomposites exhibit typical soft magnetic properties. The permeability spectra vary with the contents of SiO2. When the SiO2 content is 10 wt%, the real part μ′ of the permeability reaches about 10 and is almost independent of frequency in the frequency range up to 1 GHz. And the imaginary part μ′′ remains very low. This paper presents a facile approach to fabrication of novel soft magnetic materials for high-frequency applications.

Graphical abstractFeNi3–SiO2 nanocomposites, which are prepared by a facile hydrazine reduction combined modified Stöber method, demonstrate novel high-frequency soft magnetic properties.Figure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► FeNi3–SiO2 composite nanoparticles were obtained by a facile chemical method. ► FeNi3–SiO2 nanocomposite exhibits typical soft magnetic properties. ► High permeability and high cut-off frequency can be achieved in FeNi3–SiO2 nanocomposite.