Ni3Zn ferrite octahedral nanoparticles with high microwave permeability and high magnetic loss tangent

Abstract

Ni3Zn ferrite octahedral nanoparticles with grain size of about 40nm were synthesized via a low temperature hydrothermal route. The saturation magnetization (Ms) and coercive force (Hc) of the sample are 57.5emu/g and 197Oe, respectively. In 50MHz–8GHz frequency range, the complex permeability and complex permittivity for Ni3Zn ferrite/wax composites containing 60wt% ferrite powders were measured by a vector network analyzer. The real part μr' of the permeability exhibits high values between 4 and 1.65 in 50MHz–2GHz range, and the imaginary part μr'' of the permeability presents a broad peak with a maximum value of 1.53 at 2.1GHz, the calculated reflection loss of ferrite/wax coating with the thickness of 8mm reaches −13dB at 2.1GHz. The results indicate the as-prepared Ni3Zn ferrite octahedral nanoparticles can have applications in biomedicine, and microwave absorption and electric devices.