CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Songrong Cheng,Yingjuan Li,Kaizhao Wang,Qianxu Ye,Kun Dong,Yunzhu Wang,Sufang He,Chunjian Wang,Lingde Kong,Feng Liu,YongQiang Yang,Ji Ma,Qingming Chen,Sheng'an Yang
Polycrystalline manganese oxides exhibit remarkable tunable magnetoresistance (MR) and anisotropic magnetoresistance (AMR), rendering them highly promising for magnetic sensor applications. However, their practical utilization is hindered by two critical challenges: (i) the requirement of high magnetic fields to achieve optimal electromagnetic properties, and (ii) the deviation of the metal-insulator transition temperature (T MI ) from room temperature. In this study, La 0.68 Sm 0.02 Ca 0.3 MnO 3 :Ag x ( x = 0.1–0.4) composites were synthesized via sol–gel and solid-phase methods. Notably, at x = 0.2, exceptional MR and AMR values of 88 % and 123 %, respectively, were achieved near room temperature under a low magnetic field of 1 T. This represents the highest AMR performance reported to date for polycrystalline materials under similar conditions, comparable to thin films. The incorporation of Ag was found to mitigate grain boundary scattering while enhancing interfacial spin polarization, thereby significantly improving MR. The extraordinary AMR is attributed to the anisotropic spin–orbit coupling (SOC) effect. Resistivity data were well–fitted using electron-scattering and small-polaron hopping models, further validating the pivotal role of SOC in enhancing AMR under varying magnetic fields. These findings provide a robust foundation for advancing perovskite manganese oxides in manganite–based device applications.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2012
·Vol. 23
·期 12
·2098-2103
·
IF 1.076
Zhou Dongxiang,Hao Liangbin,Gong Shuping,Fu Qiuyun,Xue Fei,Jian Gang
This paper presents the structural, ferroelectric, ferromagnetic, resonance and magnetoelectric (ME) properties of multilayered ME composites fabricated using tape casting method. The compositions corresponding to CoFe 2 O 4 (CFO) with particle size of ~150 nm and BaTiO 3 (BTO) with particle size of ~100 nm were chosen as ferromagnetic and ferroelectric phases, respectively. Delamination was found at the interface between CFO and BTO layers, which was related to the residual stress due to the difference in thermal expansion coefficient between the two layers. The largest direct magnetoelectric and converse magnetoelectric coefficients of the multilayered ME composite were, respectively, 36 μV/cm Oe at a bias magnetic field of 2,800 Oe and 1.16 × 10 −3 G/V at a frequency of 30 kHz. In addition, the corresponding interfacial coupling coefficient was calculated to be 3.2 × 10 −5 . For the multilayered ME composite, a resonance frequency of 4.96 MHz and a bandwidth of 40 kHz were obtained using capacitance-frequency spectrum method.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Sheng’an Yang,Qingming Chen,Yunrui Yang,Yan Gao,Ruidong Xu,Hui Zhang,Ji Ma
Perovskite manganite La 1− y Ca y MnO 3 has giant and tunable magnetoresistance ( MR ) and anisotropic magnetoresistance ( AMR ), still the following two challenges are of great concern: (i) large magnetic field is required for achieving excellent electromagnetic performance; and (ii) metal–insulator (M–I) transition temperature ( T MI ) significantly different from room temperature; both these factors limit its practical applications. In this study, polycrystalline La 0.7 Ca 0.3 MnO 3 :Ag x composites were fabricated by sol–gel and solid–phase addition methods, and large MR and AMR (84.1% and 32%, respectively) were obtained at near room temperature in 1 T magnetic field when x = 0.2. Evidently, it was found that the grain boundary scattering effects were weakened due to Ag−addition, which resulted in an enhancement of MR . The tremendously high AMR value was attributed to the anisotropic spin–orbit coupling (SOC) effect. The electron–scattering and small–polaron hopping models were used to successfully fit the resistivity data, which support the SOC effect under different magnetic fields that enhance the AMR . These results support further development of the perovskite manganese oxide with potential applications in manganite devices.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 35
·期 1
·1-13
·
IF 2.8
Ding Yiwen,Ren KeJu,Zeng Zhixin,Meng Gang,Gao Rongli,Deng Xiaoling,Chen Gang,Cai Wei,Fu Chunlin,Wang Zhenhua,Lei Xiang
The potential applications of magnetoelectric composites in capacitors, sensors, memory electronic devices, and energy harvesting devices have aroused great interest due to their mutual coupling between ferroelectric and ferromagnetic phases. In this paper, BFO/CFO composite films were prepared by the sol–gel method, and the regulation of magneto-photoelectric and coupling properties of BFO/CFO films with different compositions was studied. The results show that with the increase of BFO composition, the interface between BFO layer and BFO layer also appears, the dielectric constant of the film decreases with increasing the content of BFO, and the photoelectric conversion efficiency of the film increases at first and then decreases with the increase of BFO content. When the composition is 4BFO/6CFO, the photoelectric conversion efficiency of the composite film is the highest, which is 2.02 × 10 −3 %. With the increase of CFO content, the remanent magnetization and saturation magnetization of the film increase gradually. However, when the compositions are 4BFO/6CFO and 3BFO/7CFO, their leakage current is high, resulting in the degradation of ferroelectric properties. The composition 5BFO/5CFO has the highest magnetodielectric and photo induced magnetodielectric response, the corresponding values are 2.21% and 3.88%, respectively. The magnetoelectric coupling coefficient of the film is greatly increased under the action of light, reaching 115%, which could plausibly relate to the photovoltaic effect and the photostriction effects of the film. These results may provide good guidance on designing new photoelectromagnetic detector.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Qihui Sun,Jinyao Li,Hongyan Zhang,Xiong He,Baoshan Wu,Junwei Wang,Nasir Mahmood,Xian Jian
Traditional single-component microwave absorbers face the difficulties including the narrow absorption bandwidth and low absorption strength. Herein, we develop a novel dual-magnetic composite decorating with covalent-organic framework (COF of 1,3,5-triformylphloroglucinol and p-phenylenediamine: TpPa) and carbon hybrid to enhance microwave absorption performance. Namely, a dual-magnetic FeSiAl@(CoFe 2 O 4 /C)@TpPa core–shell structure with rich interfacial polarizations was prepared by the three main steps: firstly, the plate-like FeSiAl was decorated with the MOFs of ZIF-67. And then it was converted to FeSiAl@(CoFe 2 O 4 /C) after an annealing process under Ar. Lastly, the in-situ growth of COF (TpPa) was designed for enhanced microwave penetration into the interior of absorbers. The as-design dual-magnetic FeSiAl/CoFe 2 O 4 effectively favors to magnetic domain resonance resulting in the dual-magnetic coupling effects. Meanwhile, the multi-level structure formed by ultra-fine carbon in FeSiAl@(CoFe 2 O 4 /C)@TpPa enables magnetic-dielectric synergies and enriches the attenuation path as well. Furthermore, the accumulation of transferred charge at multiple interfaces provides a stronger relaxation polarization loss. The above positive factors collectively promote the high-performance microwave absorption with the reflection loss (RL) value up to −51.3 dB and the effective absorption bandwidth (EAB) covers 3.2–17.7 GHz by adjusting the thickness of absorbers. Therefore, this dual-magnetic/dielectric coupling approach provides an innovative strategy for fabricating advanced microwave absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2024
·
IF 4.3
Mohan Huang,Kun Zhao,Shuangyan Liu,Ang Bian,Lu Jiang,Dawei He,Jiaqi He,Yongsheng Wang
The design and development of microwave-absorbing materials with excellent performance hold significant importance in both civil and military fields. The combination of magnetic loss materials and dielectric loss materials can achieve complementary performance effects and regulate impedance matching. In this paper, spindle-like α-Fe 2 O 3 was synthesized using MIL-88A as a template, which was then composited with Ti 3 C 2 T x phase possessing excellent electrical conductivity to obtain Fe 2 O 3 /Ti 3 C 2 T x composites. Ti 3 C 2 T x can provide good conductance loss and dipole polarization relaxation, while the incorporation of Fe 2 O 3 between the layers of Ti 3 C 2 T x not only triggers the interfacial polarization effect but also increases layer spacing, thereby enhancing multiple reflection effects. Furthermore, the magnetic-dielectric synergies further optimize the impedance matching. Through the combined action of multiple mechanisms, the Fe 2 O 3 /Ti 3 C 2 T x composites (with a mass ratio of 1:3 for Fe 2 O 3 and Ti 3 C 2 T x ) exhibit a minimum reflection loss of −34 dB and an effective absorption bandwidth of 1.53 GHz at a thickness of 3 mm, as well as an effective absorption bandwidth of 2.805 GHz at a thickness of 1.5 mm. This paper presents a reference strategy for constructing highly efficient microwave absorbers derived from Metal-organic frameworks (MOFs) and MXene based on their outstanding properties.
研究领域:
材料科学
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电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2025
·
IF 6.7
Bowei Liu,Rui Feng,Ling Zhou,Tong Zhou,Peng Su,Guanghui Zhao,Lijie Dong
Flexible multiferroic materials with lightweight, wearability, portability and high magnetoelectric conversion present significant potential for applications in wearable, wireless and self-powered device engineering. However, simultaneously achieving high magnetoelectric conversion and ideal flexibility remains a demanding challenge of multiferroic composite materials. Here, novel flexible magnetoelectric nanocomposite films are developed based on the self-synthesized ultra-fine magnetostrictive nanofibers and electrostrictive polymer P(VDF-TrFE). The ultra-fine magnetostrictive nanofibers have been tailored into 15 nm of average diameter by utilizing an ultra-fine polymer template ( s PPTA). This design aligns with the dimensions of P(VDF-TrFE) crystals to ensure optimal interfacial compatibility and effective stress transfer between the magnetostrictive and electrostrictive phase. Remarkably, a small amount (3 wt%) of nanofibers in the nanocomposite films enables a synergistic output effect of magnetoelectric coupling coefficient of 43.0 mV·cm −1 ·Oe −1 . The incorporation of ultra-fine and low-content nanofillers contributes to the lightweight and flexible nature of the nanocomposite films with the elongation at a break of 9 %. Moreover, the magneto-machine-electric conversion shows 7 % enhancement with a magnetic field application to verify the active effect of the magnetic field on strain response. This approach opens up a new avenue for the design and modulation of flexible magnetoelectric films and paves the way for wireless and wearable multifunctional devices.
研究领域:
材料科学
·
电子工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2023
·Vol. 13
·期 7
·1140
·
IF 2.7
Jiuyuan Han,Mengjiao Chi,Liu Yang,Bing Liu,Minmin Mao,Hadi Barzegar Bafrooei,Zhongyan Ma,Yingjie Ren,Feng Shi,Ehsan Taheri-Nassaj,Dawei Wang,Kaixin Song
In this study, dense composites of xNaCl-(1−x)Ni0.5Zn0.5Fe2O4(referred to as NaCl-NZO) and xH3BO3-(0.8−x)Ni0.5Zn0.5Fe2O4-0.2NaCl (referred to as HB-NZO-NaCl) were prepared using the cold sintering process. The objective was to investigate the cold sintering procedure for fabricating ferrite composite ceramics with comparable permeability and dielectric constants suitable for radio-frequency electronic device applications. Optimal cold sintering conditions were determined as 200 °C/30 min/500 MPa with a relative density of 95% for NaCl-NZO and 120 °C/30 min/300 MPa with a relative density of 95.4% for HB-NZO-NaCl. X-ray diffraction and scanning electron microscope analyses confirmed the absence of secondary phases. The resulting composite ceramics showed promising characteristics, with the 0.5NaCl-0.5NZO composition exhibiting a dielectric constant of 6.2 @ 100 MHz, dielectric loss of 0.02 @ 100 MHz, permeability of 2.5 @ 100 MHz, and magnetic loss of 0.001 @ 100 MHz. Similarly, the 0.3HB-0.5NZO-0.2NaCl composition displayed a dielectric constant of 5.9 @ 100 MHz, dielectric loss of 0.02 @ 100 MHz, permeability of 5.1 @ 100 MHz, and magnetic loss of 5 × 10−4@ 100 MHz. These findings indicate potential applications in wireless communication.Keywords:cold sintering;magnetic–dielectric materials;ferrite;dielectric constant
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Fengyu Kong,Wei Ning,Anding Wang,Yan Liu,Mingliang Tian
Bi is a semimetal with unusual and attractive electronic properties. However, synthesis of nanoscale 0-2D Bi single crystal with good dispersity and quality without surfactants and substrates is still a challenge. In this paper, a novel, simple and low-cost solvothermal method for synthesis of 0-2D nanoscale Bi at mild conditions and without a surfactant/substrate is reported. By using Bi(NO 3 ) 3 ·5H 2 O or NaBiO 3 ·2H 2 O as Bi sources and environmental friendly C 3 H 8 O 3 as solvent, we synthesized nanospheres , nanowires and nanoribbons characterized with monodispersity, high purity and crystallinity. The growth mechanism of the 0-2D nanostructure was discussed. It is found that the Bi source, concentration and solvent significantly influences the morphology and size. Single crystal free-standing nanoribbon has large magnetoresistance up to 540% at 100 K. This novel approach can be applied in synthesis of nanostructured Bi single crystals and the large-scale fabrication of some other nanostructured semimetals.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 22
·20277-20284
·
IF 2.22
Wu Xiao-Hui,Tao Zheng-Xiong,Li Le-Zhong,Wu Chong-Sheng,Zhong Xiao-Xi,Wang Rui,Xiang Peng-Cheng,Li Ke-Lin,Lin Nan
In this work, Ni 0.7− x Zn 0.3 Co x Fe 2 O 4 ( x = 0, 0.05, 0.10, 0.15 and 0.20, NZCF) ferrites were successfully fabricated by solid-state reaction method. We have been more focused on the effects of cobalt-substituted NiZn ferrite on crystal structure, microstructure and magneto-electric properties. With gradual addition of cobalt content, since the smaller ionic radius and larger atomic weight of the cobalt, which leads to decrease lattice parameter ( a ) and enhance X-ray density ( d x ), respectively. The grain size ( D ) increases (4.86 ± 1.10 to 6.26 ± 1.67 μm). When x = 0.05, the initial permeability ( μ i ) of NiZnCo ferrites reaches the maximum value. The saturation magnetization ( M s) is firstly decreased slightly from 78.96 to 77.96 emu/g when x ≤ 0.10, then increased to 83.14 emu/g ( x = 0.15), ultimately decreased to 81.54 emu/g. Meanwhile, the coercivity ( H c) is dropped from 19.95 to 13.25 Oe when x ≤ 0.05, and stabilized at about 13.40 Oe when x > 0.05. From the dielectric spectrum, the real dielectric constant (ε′) exhibits typical relaxation-dispersion behavior with increasing frequency. The resistivity temperature spectrum also shows good performance: both dc resistivity ( ρ ) and activation energy ( E ρ ) increase with the Co substitution. Here, we have developed a NiZnCo ferrite when Co-substituted x = 0.05 with the highest permeability ( μ i , 123@10 kHz), higher saturation magnetization ( M s, 78.25 emu/g) and lowest coercivity ( H c, 13.25Oe), which is expected to be used in high-frequency capacitors and inductors.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Zheng Li,Yuling Su,Yuying Zuo,Gaoshang Gong,Yaran Duan,Minghao Wang,Maocai Wei,Yongqiang Wang
In this paper, the crystal structure, vacancies, magnetoelectric properties and magneto-thermal properties of Gd 1- x Dy x CrO 3 (0 ≤ x ≤ 0.5) samples were reported. In crystal structure analysis, after doping Dy 3+ , the lattice constant and the grain size of the sample decreases. The results of positron annihilation lifetime study indicates that the overall electron density near defect increases and that appeared as a gradual decreasing trend of τ 2 with Dy 3+ concentration. The ferromagnetism of the sample gradually decreased after doping, and the T N (Cr) of the sample decreased systematically with increasing concentration of Dy 3+ . Moreover, the introduction of Dy 3+ inhibited the magneto-electric coupling and weakened the magneto-thermal properties of the samples. This result reveals the effect of Dy 3+ doping on the structure, magnetic properties, magnetothermal and dielectric properties of GdCrO 3 .
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 8
·6027-6037
·
IF 3.442
Yang Dexin,Yang Tao,Chen Yulong,Liang Yu,Liu Yan’gai
Double perovskite La 2 CoMnO 6 is an attractive spintronics with magnetoelectric, magnetodielectric, and magnetoresistive effects, which are related, at least in part, to combined structural and magnetic instabilities. To explore its magnetoelastic coupling behaviour, a conventional analysis of lattice parameter data in terms of spontaneous strain shows that the ferromagnetic ordering process is accompanied by significant volume ( e aM ) and shear ( e tM ) strains. The DC and AC magnetic data reveal the antisite defects with antiphase regions, and the ferromagnetic transition is at ~ 230 K with a small antiferromagnetic ordering at about 170 K. In addition, the Rietveld refinement of the in situ variation X-ray diffraction from 120 to 1400 K, scanning electron microscopy, and differential scanning calorimetry were used to confirm the crystal structure, microstructure, magnetic, and structural anomalies of the sample synthesised in pure oxygen atmosphere. This study, and in particular the strain analysis, of La 2 CoMnO 6 will facilitate its potential application in the field of spin electronics and thin-film engineering.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
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