Structural, magnetic, and gigahertz-range electromagnetic wave absorption properties of bulk Ni–Zn ferrite

Abstract

Nickel–zinc ferrite (Ni0.5Zn0.5Fe2O4) powders were prepared by the conventional solid-state route and sintered at 1100 and 1300 °C for utilization as a tile electromagnetic wave absorber. Structural, magnetic, and microwave absorption properties were investigated by characterization techniques of X-ray diffraction, thermogravimetric analysis, Raman spectroscopy, electron microscopy, vibrating sample magnetometry, and vector network analyzer. The samples sintered at 1300 °C showed high magnetic saturation of 87 emu/g and low coercivity of 4 Oe. Electromagnetic investigations exhibit high reflection losses up to − 48.1 dB at certain high and low gigahertz frequencies, as clearly depicted in the 3D contour plot. The optimized condition between reflection loss, thickness, and bandwidth revealed a reflection loss of about − 36.1 dB at the matching thickness of 3.7 mm for the X-band. Furthermore, the effective working bandwidth at − 10 dB was up to ~ 7.1 GHz for the minimum thickness of 4.3 mm, which thoroughly covered the C-band. The microwave absorption performance of the well-sintered Ni–Zn ferrite was attributed to the incorporation of dielectric and magnetic loss mechanisms in which the magnetic part prevails.

Broadband near unity absorption meta-structure for solar thermophotovoltaic systems and optical window applications

“…74 In addition, nickel's higher resistivity, high saturation magnetization, and high permeability characteristics lead to greater absorptivity. 75 The ground and substrate layers absorb more near-infrared light than visible light. Due to impedance mismatch, the ground and substrate layers had lower visible absorbance, bringing the overall average to 72% as depicted in Fig.…”

Cu2NiSnS4 Nanoparticles Supported on rGO for Dual Frequency Range Electromagnetic Shielding

“…To develop the high performance of EAMs, a wide variety of nanomaterials, including nanoscale ferrite, carbon materials, metal sulfides, Fe/Co/Ni/carbon nanofibers, CuS@CoS 2 , and ZnS/Ni 3 S 4 as the efficient EAMs have been applied. In recent years, transition metal sulfides (TMS) have been introduced as new electromagnetic wave absorbers and composite electromagnetic-wave-absorber additives. − Compared with transition metal sulfides or oxides, the phase structures of transition metal dichalcogenides (TMDs) are determined by the d orbital electron.…”

“…Therefore, to solve this increasingly growing electromagnetic pollution crisis, the research and development of high-performance electromagnetic absorbing materials (EAMs) has received more attention. 1−3 To develop the high performance of EAMs, a wide variety of nanomaterials, including nanoscale ferrite, 4 carbon materials, 5 metal sulfides, 6 Fe/Co/Ni/carbon nanofibers, 7 CuS@CoS 2 , 8 and ZnS/Ni 3 S 4 9 as the efficient EAMs have been applied. In recent years, transition metal sulfides (TMS) have been introduced as new electromagnetic wave absorbers and composite electromagnetic-wave-absorber additives.…”

Correlation among the structural, electric and magnetic properties of Al3+ substituted Ni–Zn–Co ferrites

“…[5][6][7][8] Ferrites are ideal for high-quality multifaceted applications like home and industrial electronic devices, biomedical devices, catalysts, and EMI shielding in absorber materials because of their relatively high dielectric/magnetic loss, excellent chemical stability, and low cost. 9 The features like the high permeability in ferrite make it an attractive candidate for wide-ranging applications such as microwaves, gas sensing, multilayer chip inductor, etc. 4 Moreover, high Curie temperatures and moderate magnetic losses in the kHz range make ferrites promising for constructing heating inductors in the catalytic chemical reactors.…”