Superior Microwave Absorption Research Articles

Synergistic impacts of Fe/Fe3C and Fe-Nx on high-efficiency microwave-absorbing properties of Fe/Fe3C@NC composites

The construction of multi-component composites has become an attractive strategy for high-performance microwave absorption through balancing the magnetic and dielectric loss. However, the influences of different components on absorption performance are ambiguous, which has inevitably hampered the widespread applications of microwave absorbents. Herein, we rationally designed the multi-component absorbers of N-doped carbon composited with Fe/Fe3C nanoparticles, and systematically investigated the impacts of Fe/Fe3C nanoparticles and Fe-Nx moieties on the microwave-absorbing capacities. It is found that the coexisitence of Fe/Fe3C and Fe-Nx is indispensable to realize the strong microwave absorption ability by simultaneously enhancing the dielectric and magnetic loss in the frequency range of 2–18 GHz. As expected, our optimal absorber dispersed in paraffin with a filler loading of 15 wt% exhibits the minimum reflection loss (RLmin) value of −49 dB and the maximum effective absorption bandwidth (BWeff) value of 4.2 GHz at a low thickness. Our work specifies the importance and influence of the coexistence between the Fe-Nx configurations and Fe/Fe3C nanoparticles in the carbon-based composites for the superior microwave absorption and inspires the future fabrication of extraordinary materials in the electromagnetic field.

Ambient-drying to construct unidirectional cellulose nanofibers/ carbon nanotubes aerogel with ultra-lightweight, robust, and superior microwave absorption performance

Microwave absorption materials (MAMs) with lightweight wide effective absorption band, superb mechanical performance, and capable of large-scale preparation are highly desirable for dealing with microwave pollution, but it is still a challenge to realize these performances simultaneously on one material. Herein, we report an ambient drying and non-chemical cross-linking way of preparing high-performance microwave absorption aerogels from cellulose nanofibers (CNF) and carbon nanotubes (CNT). Anisotropic aerogel pore walls with excellent mechanical properties can be constructed by unidirectional cycling freeze-thaw to cross-linking CNF and CNT. During this process, a sustainable bioinspired dual-networks interpenetrating strategy is constructed by benefiting from the mono-dispersion of CNF and CNT, thus enabling the creation of hybrid dual-networks of hydrophobic/hydrophilic nanofibers. Impressively, it is found that the dual-networks induced anisotropic aerogel structure and dense pore walls can synergistically result in favorable mechanical properties. In detail, aerogels with tunable ultralow densities (0.0262–0.0296 g cm−3), high mechanical properties (the stress of the sample reaches up to 329.8 kPa at 75% strain) and low shrinkage (∼10%) can be prepared. Besides, the aerogels behave a large-scale production future (diameter of aerogel up to 9.24 cm). The as-prepared aerogel delivers a remarkable minimal reflection loss (RLmin) of −60.22 dB at 13.012 GHz and a wide effective absorption bandwidth (EAB) from 2.163 to 18 GHz (15.84 GHz) at a thin thickness of 7.46 mm, which covers almost all the S, C, X, and Ku bands. This work provides a strategy to prepare lightweight and efficient microwave absorbers, as well as illustrates good impedance matching and moderate dielectric loss capability.

Core-shell FeCo@carbon nanocages encapsulated in biomass-derived carbon aerogel: Architecture design and interface engineering of lightweight, anti-corrosion and superior microwave absorption

The development of multifunctional microwave absorbing materials for practical applications in complex environments is a challenging research hotspot. Herein, the core–shell structure FeCo@C nanocages were successfully anchored on the surface of biomass-derived carbon (BDC) from pleurotus eryngii (PE) via freeze-drying and electrostatic self-assembly process, achieving lightweight, anti-corrosive, and excellent absorption properties. The superior versatility benefits from the large specific surface area, high conductivity, three-dimensional cross-linked networks, and appropriate impedance matching characteristics. The as-prepared aerogel realizes a minimum reflection loss (RLmin) of −69.5 dB with a corresponding effective absorption bandwidth (EAB) of 8.6 GHz at 2.9 mm. Simultaneously, the computer simulation technique (CST) further proves that the multifunctional material can dissipate microwave energy in actual applications. More importantly, the special heterostructure of aerogel endows excellent resistance to acid, alkali, salt medium, allowing potential applications of the microwave absorbing materials under complex environmental conditions.

Construction of chiral-magnetic-dielectric trinity composites for efficient microwave absorption with low filling ratio and thin thickness

The combination of carbon nanomaterials and magnetic nanomaterials has been proven to be a promising strategy to fabricate thin and lightweight microwave absorbers with tunable absorption bands and broadened bandwidth, especially the absorption capability in low frequency (2–10 GHz). Herein, a series of CoNi-based magnetic nanomaterials have been synthesized on the surfaces of chiral carbon nanocoils (CNCs) to form a chiral-magnetic-dielectric trinity composite through solvothermal reaction followed by a subsequent annealing method. The well-dispersed CoNi nanostructures enhance the magnetic loss of the composites, giving rise to the strong microwave absorption at low frequency. In addition, the dielectric CNCs with excellent chirality and dispersibility not only provide conduction loss and cross-polarization loss to broaden the absorption bandwidth, but also reduce the filling ratio of the composites. Accordingly, with the synergistic effect of the chiral-magnetic-dielectric components, combined with the good impedance and quarter-wavelength matchings, the trinity composite exhibits superior microwave absorption performance with a wide effective bandwidth of 6.1 GHz at the thickness of 1.85 mm. More importantly, the reflection loss value reaches −42 dB at 4.5 GHz with a low filling ratio of 12 wt%. This study provides a novel chiral-magnetic-dielectric trinity structure for highly efficient microwave absorption.

Detailed microwave loss mechanisms for nanocomposites of La-doped BaFe12O19 and polyaniline

To mitigate the undesirable effects of electromagnetic pollution on the precise instrument, biological health, and human life, high-efficiency microwave-absorbing materials (MAMs) have been pursued by the scientific community. MAMs also have important potential for information security, 5G, energy harvesting, reduced radar cross-section, and military stealth technology. In this work, magnetic/dielectric composites of La-doped BaFe12O19 (La-BaM) and polyaniline (PANI) were developed to be MAMs. Composites with no and 30% of La concentration (named M0-C and M3-C, respectively) showed poor microwave absorption performance with reflection loss (RL) values of about −20 dB, meaning 99% of the incident microwave was absorbed. The effective absorption bandwidths (EABs) were narrow, with values of 0.70 and 1.55 GHz, respectively. In contrast, the microwave absorption performance of composites with 10% and 50% of La concentration (named M1-C and M5-C, respectively), reached excellent values in both RL and EAB of −47.83 and −43.53 dB and 3.98 and 3.43 GHz, respectively. These RL values implied that 99.99% of the incident microwave could be absorbed. The superior microwave absorption properties of M1-C and M5-C composites could be attributed to their excellent impedance matching, better natural ferromagnetic resonance, exchange resonance, and better attenuation constant. The loss mechanism of microwave energy in La-BaM/PANI composites could be attributed to interfacial polarization at the interfaces of two phases, dipole polarization and micro-current and conductive loss (from PANI), eddy current (from La-BaM), multiple reflection and scattering (from the dispersion of PANI into La-BaM), as well as thermal energy dissipation (from embedding La-BaM/PANI into the epoxy matrix).

3D porous PVDF foam anchored with ultra-low content of graphene and Ni nanochains towards wideband electromagnetic waves absorption

Recently, the three-dimensional (3D) porous cellular foam derived from poly (vinylidene fluoride) (PVDF) via a simple CO2-assisted procedure has been widely applied as electromagnetic (EM) wave absorbing materials due to its one-step preparation process and high void fraction. However, delicate control of 3D microcellular structure by decoration of dielectric/magnetic components is still virgin. Herein, the hierarchical structure of 3D PVDF foam decorated with an ultra-low content of graphene nanoplates (5.0 wt%) and Ni nanochains (2.4 wt%) was successfully fabricated. The correlation between microcellular structure, and electrical conductivity/microwave absorption was systematically investigated. After introducing the conductive and magnetic components, a strong enhancement of dielectric loss, coming from the presence of conduction loss and polarization loss of 3D network, and magnetic loss, originating from strong eddy current loss and the natural resonance, was observed. Meanwhile, a high void fraction (∼92%) greatly optimized the impedance matching of incident waves and favored the multi-scattering. As a result, the superior microwave absorption was obtained, in which the effective absorption bandwidth (frequency with 90% microwave dissipation) can cover the whole K band (18–26.5 GHz) under the thickness of 3 mm. Overall, this work provides an ameliorated strategy for porous foams applied in microwave absorption.

Hierarchical Carbon Network Composites Derived from ZIF-8 for High-Efficiency Microwave Absorption.

Metal-organic framework (MOF)-derived composites have gained wide attention due to their specific structures and enhanced performance. In this work, we prepared carbon nanotubes with Fe nanoparticles connected to two-dimensional (2D) hierarchical carbon network composites via a low-pressure gas-solid reaction strategy. Specifically, the three-dimensional (3D) networks derived from ZIF-8 exploited the carbon nanotubes with the function of charge modulation. Meanwhile, we utilized the interconnected 2D nanostructures to optimize impedance matching and facilitate multiple scattering, ultimately improving the overall microwave absorption performance. Furthermore, based on the well-designed structures, the composites prepared at 800 °C (Fe-N-C@CNTs-800) achieved the best reflection loss (RL) of -58.5 dB, thereby obtaining superior microwave absorption performance. Overall, this study provides a good groundwork for further investigation into the modification and dimension design of novel hierarchical microwave absorbers.

Synthesis of a one-dimensional carbon nanotube-decorated three-dimensional crucifix carbon architecture embedded with Co7Fe3/Co5.47N nanoparticles for high-performance microwave absorption

Low-dimensional cell-decorated three-dimensional (3D) hierarchical structures are considered excellent candidates for achieving remarkable microwave absorption. In the present work, a one-dimensional (1D) carbon nanotube (CNT)-decorated 3D crucifix carbon framework embedded with Co7Fe3/Co5.47N nanoparticles (NPs) was fabricated by the in-situ pyrolysis of a trimetallic metal–organic framework (MOF) precursor (ZIF-ZnFeCo). Co7Fe3/Co5.47N NPs were uniformly dispersed on the carbon matrix. The 1D CNT nanostructure was well regulated on the 3D crucifix surface by changing the pyrolysis temperature. The synergistic effect of 1D CNT and the 3D crucifix carbon framework increased the conductive loss, and Co7Fe3/Co5.47N NPs induced interfacial polarization and magnetic loss; thus, the composite manifested superior microwave absorption performance. The optimum absorption intensity was −54.0 dB, and the effective absorption frequency bandwidth reached 5.4 GHz at a thickness of 1.65 mm. The findings of this work could provide significant guidance for the fabrication of MOF-derived hybrids for high-performance microwave absorption applications.

Grain boundary capacitance effect in Iron-based magnetic composites for superior C-band microwave absorption

Urgently, the absorbing bandwidth of magnetic materials is enormously limited in C-band by the exorbitant magnetic response. There are few reports about C-band absorber. In this paper, iron-based magnetic composites with large-angle grain boundaries (120°) were prepared by gelatinized starch assisted separation nucleation and solid phase sintering. Noteworthily, grain boundary capacitance layer is formed at the grain boundaries, effectively enhancing its dielectric parameters. This is facilitated to achieve balanced impedance matching. Therefore, the effective absorption bandwidth (EAB) of FFC-B covered the whole C-band (4–8 GHz). Natural resonance and impedance matching realized by grain boundary capacitance effect were confirmed to be the key to such wide EAB for FFC-B in C-band. This work explores the important role of grain boundary capacitance effect in regulating the dielectric parameters of iron-based magnetic materials, and provides a feasible strategy of grain boundary engineering for the low-frequency and wide EAB electromagnetic performance.

Facile synthesis of 2D MoS2/reduced graphene oxide hybrids with excellent microwave absorption

High-performance microwave absorption materials with tunable electromagnetic properties have long been the goal of researchers. It is still a challenge to achieve broad band absorption and lightweight performance by simply optimizing the chemical composition of absorbers. Molybdenum disulfide (MoS2) belongs to the two-dimensional transition metal disulfide with a layered structure similar to graphene. In this work, two-dimensional MoS2/reduced graphene oxide (MS/RGO) hybrids have been constructed through a convenient self-assembled hydrothermal method, in which MoS2 ultrathin nanosheets in-situ grow uniformly on the surface of RGO, constructing a unique hierarchical microstructure. Electromagnetic parameter measurements display that the dielectric behaviors of MS/RGO composites are optimized via changing the content of RGO, and meanwhile the superior microwave absorption properties are achieved with the filler-loading ratio of only 20 wt%. The widest effective absorption bandwidths (RL<−10 dB) of 5.68 GHz (12.32–18 GHz) and 6.32 GHz (11.20–17.52 GHz) are observed at a thickness of 2.0 mm for MS/RGO-10 and MS/RGO-15, respectively. When the thickness is raised to 5.0 mm, the reflection loss value of MS/RGO-10 composites reaches the minimum value of − 39.8 dB at 4.96 GHz. The improved performance can be explained by the strong interfacial polarization loss due to abundant heterogeneous interfaces, defect dipole polarization, conduction loss, and multiple reflections and scattering. The results indicate that the light-weight MS/RGO composite is considered as a promising candidate for high-performance microwave absorbers with an adequate absorption bandwidth.

Constructing multi-effect synergistic rare-earth doped CoFe2O4/CoFe composites for improved microwave absorption performance

It is an appealing strategy to improving the low reflection loss and narrow microwave absorption band of cobalt ferrite-derived composites by optimizing the various components of the material and building microstructures with complementary properties. In this study, rare-earth doped CoFe2O4/CoFe composites (LCF-2, NCF-2, ECF-2) were synthesized via the sol-gel self-combustion and reduction process, a two-step route. The results show that the effects on the cation vacancies and charge distribution of CoFe2O4 showed differences attributed to the doping of La, Nd, and Eu. While the CoFe introduced by reduction increases the oxygen vacancies and grows on the material surface to form a non-uniform, strongly coupled CoFe2O4–CoFe heterointerface. Benefiting from the multi-effect synergy of rare earth and CoFe on cobalt ferrite, the electromagnetic properties and microwave attenuation of the composites were significantly enhanced. And the potential microwave dissipation mechanism was also explicated. Notably, LCF-2 exhibited superior microwave absorption performance with a minimum reflection loss of −65.2 dB and an effective absorption bandwidth of 5.1 GHz at a thin thickness of 1.6 mm. Our works will provide some reference for the design of efficient and broadband microwave absorbing composites in the future.

One Pot Self-Assembling Fe@PANI Core–Shell Nanowires for Radar Absorption Application

The one-pot process, which combines the polymerization of polyaniline (i.e., PANI) with subsequent reduction of iron nanowire (i.e., Fe NW) under a magnetic field, was developed to produce Fe@PANI core-shell nanowires. The synthesized nanowires with various PANI additions (0-30 wt.%) were characterized and used as microwave absorbers. Epoxy composites with 10 wt.% absorbers were prepared and examined using the coaxial method to reveal their microwave absorbing performance. Experimental results showed that the Fe NWs with PANI additions (0-30 wt.%) had average diameters ranging from 124.72 to 309.73 nm. As PANI addition increases, the α-Fe phase content and the grain size decrease, while the specific surface area increases. The nanowire-added composites exhibited superior microwave absorption performance with wide effective absorption bandwidths. Among them, Fe@PANI-90/10 exhibits the best overall microwave absorption performance. With a thickness of 2.3 mm, effective absorption bandwidth was the widest and reached 3.73 GHz, ranging from 9.73 to 13.46 GHz. Whereas with a thickness of 5.4 mm, Fe@PANI-90/10 reached the best reflection loss of -31.87 dB at 4.53 GHz.

Ultralight α–Si3N4w/SiC foam ceramics with superior microwave absorption performance in X- and Ku-bands

Three–dimensional (3D) interconnected hierarchical porous Si3N4w/SiC foam ceramics with high porosity (84.75%) were prepared using foam–gelcasting and an in–situ catalytic nitridation reaction. The effects of Si3N4 whisker content on the pore structures, mechanical properties, dielectric properties, and wave–absorbing properties of these foam ceramics were investigated, and the mechanisms governing pore formation, whisker growth, and wave absorption were thoroughly explored. The increase of Si3N4 whisker content reduced the dielectric loss but improved the absorption performance. The minimum reflection loss value of SC–1.5SN with a thickness of 3.9 mm was −66.49 dB at 9.6 GHz, and the effective absorption bandwidth can cover the entire X–band and Ku–band by adjusting the material thickness. The excellent absorption properties of porous Si3N4w/SiC foam ceramics can be attributed to the absorption loss and interference cancellation. These foam ceramics display great application potential in electromagnetic wave absorption.

Ti3C2Tx/Co-MOF derived TiO2/Co/C composites for broadband and high absorption of electromagnetic wave

With the dramatic development of electronic and radar detection technologies, electromagnetic (EM) wave absorbing and shielding materials with superior microwave absorption (MWA) performance, light weight and wide bandwidth are widely concerned. Herein, novel Ti3C2Tx/Co-MOF derived TiO2/Co/C composite architectures with rutile-TiO2 decorated carbon flakes originated from Ti3C2Tx and Co/C composites with wrapped Co in the tips of carbon nanotubes (CNTs) are fabricated by in-situ solvothermal growth and pyrolysis. The multi-component synergistic effect and appropriate combination with adjustable amount of Ti3C2Tx loading and Co-MOF size optimize the impedance matching and exhibit satisfactory broadband EM wave absorption. The nanocomposites achieve effective absorption bandwidth (EAB) of 5.48 GHz at only 1.7 mm, and the minimum reflection loss (RLmin) value of −50.45 dB at 7.32 GHz with a 3.0 mm thickness. The outstanding broadband MWA properties cover nearly the whole frequency bands of C, X, and Ku with the corresponding RLmin values almost below −30 dB. This work highlights a promising strategy to design and synthesize various MOF-derived carbon composites with excellent MWA capacities.

One-Pot Synthesis of Ag/AgCl Heterojunction Nanoparticles on Polyaniline Nanocone Arrays on Graphene Oxide for Microwave Absorption

Heterointerfaces in microwave absorption materials can induce dielectric polarization relaxation for superior microwave absorption capacity. Nevertheless, the construction of favorable hierarchical structures in dielectric heterogeneous materials remains a considerable challenge. Herein, Ag/AgCl heterojunction (HAg) nanoparticles are successfully decorated on polyaniline (PANI)/graphene oxide (GO) sheets through simple one-pot interfacial polymerization. The synthesized HAg/PANI/GO hybrid exhibits superior microwave absorption performance due to the multi-heterogeneous and hierarchical structures, which provides numerous interface polarizations, dipolar relaxations, and improved impedance matching. The minimum reflection loss of the optimum HAg/PANI/GO hybrid reaches −61.14 dB at 11.32 GHz with an effective absorption bandwidth of 4.77 GHz in the range from 9.70 to 14.47 GHz. This work provides ideas for producing multi-heterogeneous and hierarchical structures to reach a high microwave absorption performance.

Broadband electromagnetic dissipation superiority of hierarchical ZnO flakes co-decorated with CoFe/CoFe2O4 and rGO

Currently, in order to solve the increasing issues caused by the electromagnetic radiation pollution and broadened radar detection bandwidth, electromagnetic wave dissipating materials with high performance of broadband absorption are desired urgently. Herein, the CoFe/CoFe2O4/ZnO/rGO composites composed of hierarchical ZnO flakes with anchored CoFe/CoFe2O4 and rGO-doping were synthesized via a facile aging approach and subsequent calcination process under vacuum atmosphere. The constituents and electromagnetic parameters of absorbers could be efficiently modulated through tuning the additive amount of raw GO. Notably, the composite with GO additive amount of 0.025 g exhibits a prominent broadband electromagnetic wave absorbing capacity. In detail, the widest effective absorption bandwidth reaches 7.66 GHz with thin thickness of just 2.5 mm. This superior broadband microwave absorption property is owing to the synergistic effect of hierarchical nanostructure and well-matched impedance, as well as enhanced interfacial polarization, conduction loss, eddy current, natural and exchange magnetic resonances. The investigation demonstrates the specific CoFe/CoFe2O4/ZnO/rGO composite is a potential candidate to be applied for broadband military radar stealth and serious electromagnetic radiation contamination.

Customizing the structure and chemical composition of ultralight carbon foams for superior microwave absorption performance

Developing biomass-derived three-dimensional porous carbon materials (porous carbon foam, PCF) has become a common strategy to obtain lightweight and efficient electromagnetic microwave-absorbing materials. Without the introduction of a template and subsequent activation process, several ultra-lightweight honeycomb PCF samples were successfully prepared from dried ballonflower/yamakurage (DB) by simple calcination. In addition, the calcination temperature plays a decisive role in regulating the pore size, composition and microwave absorption properties of PCF samples. Furthermore, it is worth noting that different cutting directions also influenced the hole size of the PCF sample and the microwave absorption performances. Under the combined effects of multiple reflections and scattering of PCF porous structure, dipole polarization of abundant heterogeneous atoms and good conductive loss of carbon material, the vertical cutting sample PCF-900V exhibits optimal microwave absorption performances with the minimal reflection loss (RLmin) value of −46.95 dB at 1.46 mm thickness and the effective absorption bandwidth (EAB) value of 5.52 GHz at 1.72 mm matching thickness respectively, indicating its great potential for application as a promising lightweight and efficient microwave absorbing material.

Construction of self-assembled bilayer core–shell V2O3 microspheres as absorber with superior microwave absorption performance

The design and preparation of heterogeneous structures of dielectric materials has been the mainstream direction for the construction of superior microwave absorption materials (MAMs). We report a facile and efficient procedure combination of hydrothermal process and subsequent heat treatment for successfully prepared bilayer core–shell structure self-assembled V2O3 microspheres (BCSV). The microstructure, defects, dielectric properties and microwave absorption (MA) properties of BCSV were systematically investigated, and the effect of bilayer core–shell structure on the MA properties was discussed. By varying the heat treatment temperature, it is feasible to regulate the thickness of V2O3 bilayer and its unique structure defects, hence enhancing the attenuation and multiple polarization loss of electromagnetic waves inside the microspheres. Self-assembled V2O3 microspheres with bilayer core–shell structure exhibit high-performance MA property. The reflection loss (RL) gets to − 67.12 dB at 11.69 GHz covering the whole X-band after heat treatment at 600 °C, and the broad effective absorption bandwidth is 5.49 GHz with a thickness of 2.20 mm. The conductivity loss, multiple polarization loss and dielectric loss are ascribed to the specific bilayer core–shell structure. Thus, our work provides a good perspective on how to create vanadium oxide-based MAMs with effective absorption and broad bandwidth.

Construction of multi-dimensional NiCo/C/CNT/rGO aerogel by MOF derivative for efficient microwave absorption

The development of high-performance microwave absorption materials is currently imperative in order to solve the problem of electromagnetic pollution. Herein, we successfully obtained a multi-dimensional graphene-based aerogel (NiCo/C/CNT/rGO aerogel) decorated with one-dimensional carbon nanotubes (CNTs) and metal-organic framework (MOF) derivatives. The introduction of rGO aerogel significantly modifies the phase composition (NiCo/C/CNT and rGO) and hierarchical structure (1D CNT, 3D NiCo/C/CNT and rGO aerogel) of the composite, resulting in a multi-dimensional gradient, defects, heterogeneous interfaces, and superior microwave absorption properties. The optimum electromagnetic wave absorption performance of −58.8 dB is achieved at a filler loading of 20 wt%, with a thickness of 1.8 mm and an effective absorption bandwidth of 7.6 GHz, covering the entire Ku-band. The excellent electromagnetic wave absorption performance can be attributed to the synergistic effect of impedance matching, electromagnetic attenuation capability, unique multi-dimensional porous structure, abundant defects and interfaces. In summary, the present work provides a novel approach for the synthesis of multi-dimensional lightweight magnetic/dielectric microwave absorbers.

Achieving Multiple-Resonance Permeability at Centimeter Waveband by Joint Strategies of Hard/Soft Exchange-Coupling and Selective Doping for Superior Microwave Absorption

With the prosperous development of radar technology and 5G communication, the microwave absorbing materials have become extremely crucial to improve the service life of weapons and working quality of equipment in modern society. However, it still remains a huge challenge to achieve broad absorption bandwidth at centimeter waveband due to the frequency-dependent quarter-wavelength matching thickness. In this work, the Ba(ZrNi)0.6Fe10.8O19/NiFe2O4 composites are proposed and prepared by an in situ sol–gel method. Herein, the hard/soft magnetic exchange-coupling and the selective doping strategies are dexterously integrated to achieve multiple-resonance permeability at centimeter waveband. In addition, by changing the ratio of hard and soft magnetic phases, the coupling effect is regulated to modify the multimagnetic resonance effect and optimize the absorption bandwidth. Finally, the maximum absorption bandwidth of the Ba(ZrNi)0.6Fe10.8O19/NiFe2O4 composites reaches (RL < −5 dB) to 8.6 GHz, exhibiting a promising prospect in centimeter-wave absorption.