Development of high-performance microwave absorption materials(MAM)with stabilized magnetic properties at high temperatures is specifically essential but remains challenging.Moreover,the Snoke's limitation restrai...Development of high-performance microwave absorption materials(MAM)with stabilized magnetic properties at high temperatures is specifically essential but remains challenging.Moreover,the Snoke's limitation restrains the microwave absorption(MA)property of magnetic materials.Modulating alloy components is considered an effective way to solve the aforementioned problems.Herein,a hollow medium-entropy FeCoNiAl alloy with a stable magnetic property is prepared via simple spray-drying and two-step annealing for efficient MA.FeCoNiAl exhibited an ultrabroad effective absorption band(EAB)of 5.84 GHz(12.16–18 GHz)at a thickness of just 1.6 mm,revealing an excellent absorption capability.Furthermore,the MA mechanism of FeCoNiAl is comprehensively investigated via off-axis holography.Finally,the electromagnetic properties,antioxidant properties,and residual magnetism at high temperatures of FeCoNiAl alloys are summarized in detail,providing new insights into the preparation of MAM operating at elevated temperatures.展开更多
Magnetic/dielectric composite materials with numerous heterointerfaces are highly promising functional materials, which are widely applied in the fields of electromagnetic wave absorption. Constructing heterogeneous s...Magnetic/dielectric composite materials with numerous heterointerfaces are highly promising functional materials, which are widely applied in the fields of electromagnetic wave absorption. Constructing heterogeneous structure is beneficial to further enhance the microwave absorption performance of composite materials. However, the process of constructing multi-heterogeneous interfaces is extremely complex. In this work, hollow porous FeCo/Cu/CNTs composite microspheres are prepared by the simple spray drying method and subsequently two-step annealing treatment, which possess abundant heterogeneous interfaces, unique three-dimensional conductive network and magnetic coupling network. This unique structure is beneficial to improving the ability of dielectric loss and magnetic loss, and then achieving an excellent microwave absorption performance. The prepared FeCo/Cu/CNTs-1 composite microspheres maintain a minimum reflection loss (RL) of −48.1 dB and a maximum effective absorption bandwidth of 5.76 GHz at a thickness of 1.8 mm. Generally, this work provides a new idea for designing multi-heterogeneous of microwave absorbing materials.展开更多
Stress induction plays a special role in performance control for material science.So far,it has remained challenging to systematically investigate magnetoelectric effect under stress-mediated interaction.Here we const...Stress induction plays a special role in performance control for material science.So far,it has remained challenging to systematically investigate magnetoelectric effect under stress-mediated interaction.Here we constructed a magnetoelectric device with piezoelectric stress induction,in which the stress plays a crucial intermediate role during the controllable modification of the magnetic behavior transitions under the magnetic field or current pulse driven process.The compressive stress was found to make the above process easier and reduce energy consumption via changing the magnetic domain energy state.Meanwhile,both the domain distribution and domain-wall driven process are sensitive to stress intensity.Our magnetoelectric device integrated the advantages of voltage-stress and spin-current for the control of magnetic behavior transition with the help of micro-nano processing.For the stress-induced magnetic behavior in magnetic materials was directly imaged and quantificationally investigated,the complex interactions between stress,magnetic domain motion,magnetic field,and spin current have been clarified.展开更多
基金supported by the Ministry of Science and Technology of China(No.2021YFA1200600)the National Natural Science Foundation of China(Nos.52231007,12327804,22088101,51725101,and T2321003)+4 种基金the Science and Technology Research Project of Jiangxi Provincial Department of Education(No.GJJ200338)Key Research Project of Zhejiang Lab(No.2021PE0AC02)the“Chenguang Program”by Shanghai Education Development Foundation and Shanghai Municipal Education Commission(No.21CGA04)sponsored by Shanghai Sailing Program(No.21YF1401800)the Fund of Science and Technology on Surface Physics and Chemistry Laboratory(No.JCKYS2023120201).
文摘Development of high-performance microwave absorption materials(MAM)with stabilized magnetic properties at high temperatures is specifically essential but remains challenging.Moreover,the Snoke's limitation restrains the microwave absorption(MA)property of magnetic materials.Modulating alloy components is considered an effective way to solve the aforementioned problems.Herein,a hollow medium-entropy FeCoNiAl alloy with a stable magnetic property is prepared via simple spray-drying and two-step annealing for efficient MA.FeCoNiAl exhibited an ultrabroad effective absorption band(EAB)of 5.84 GHz(12.16–18 GHz)at a thickness of just 1.6 mm,revealing an excellent absorption capability.Furthermore,the MA mechanism of FeCoNiAl is comprehensively investigated via off-axis holography.Finally,the electromagnetic properties,antioxidant properties,and residual magnetism at high temperatures of FeCoNiAl alloys are summarized in detail,providing new insights into the preparation of MAM operating at elevated temperatures.
基金supported by the National Natural Science Foundation of China(Nos.52231007,12327804,T2321003,and 22088101)in part by the National Key Research Program of China(No.2021YFA1200600)+2 种基金the Science and Technology Research Project of Jiangxi Provincial Department of Education(No.GJJ200338)the Fund of Science and Technology on Surface Physics and Chemistry Laboratory(No.JCKYS2023120201)the Fund of Key Laboratory of High Temperature Electromagnetic Materials and Structure of MOE(No.KB202401).
文摘Magnetic/dielectric composite materials with numerous heterointerfaces are highly promising functional materials, which are widely applied in the fields of electromagnetic wave absorption. Constructing heterogeneous structure is beneficial to further enhance the microwave absorption performance of composite materials. However, the process of constructing multi-heterogeneous interfaces is extremely complex. In this work, hollow porous FeCo/Cu/CNTs composite microspheres are prepared by the simple spray drying method and subsequently two-step annealing treatment, which possess abundant heterogeneous interfaces, unique three-dimensional conductive network and magnetic coupling network. This unique structure is beneficial to improving the ability of dielectric loss and magnetic loss, and then achieving an excellent microwave absorption performance. The prepared FeCo/Cu/CNTs-1 composite microspheres maintain a minimum reflection loss (RL) of −48.1 dB and a maximum effective absorption bandwidth of 5.76 GHz at a thickness of 1.8 mm. Generally, this work provides a new idea for designing multi-heterogeneous of microwave absorbing materials.
基金supported by the National Natural Science Foundation of China(Nos.52231007,51725101,11727807,51672050,52271167,61790581,22088101)the Ministry of Science and Technology of China(973 Project Nos.2021YFA1200600 and 2018YFA0209100)+3 种基金the Shanghai Excellent Academic Leaders Program(No.19XD1400400)Key Research Project of Zhejiang Lab(No.2021PE0AC02)the“Chenguang Program”by Shanghai Education Development Foundation and Shanghai Municipal Education Commission(No.21CGA04)sponsored by Shanghai Sailing Program(No.21YF1401800).
文摘Stress induction plays a special role in performance control for material science.So far,it has remained challenging to systematically investigate magnetoelectric effect under stress-mediated interaction.Here we constructed a magnetoelectric device with piezoelectric stress induction,in which the stress plays a crucial intermediate role during the controllable modification of the magnetic behavior transitions under the magnetic field or current pulse driven process.The compressive stress was found to make the above process easier and reduce energy consumption via changing the magnetic domain energy state.Meanwhile,both the domain distribution and domain-wall driven process are sensitive to stress intensity.Our magnetoelectric device integrated the advantages of voltage-stress and spin-current for the control of magnetic behavior transition with the help of micro-nano processing.For the stress-induced magnetic behavior in magnetic materials was directly imaged and quantificationally investigated,the complex interactions between stress,magnetic domain motion,magnetic field,and spin current have been clarified.
