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 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 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
Materials Today Physics
·
2021
·
IF 9.298
Feichong Yao,Wenhao Xie,Ming Yang,Hang Zhang,Hongbo Gu,Ai Du,Nithesh Naik,David P. Young,Jing Lin,Zhanhu Guo
With the purpose of ameliorating the electrical property, permittivity and magnetoresistance of polyaniline (PANI) nanofibers , three types of phenylenediamine (PDA), including o -PDA, m -PDA, and p -PDA, and different contents of PDA have been incorporated into the PANI polymer backbone by the interfacial copolymerization of aniline with PDA. The results demonstrate that different types and contents of PDAs could disclose the distinct effects on the chemical structures , crystalline structures, and morphologies for copolymers of aniline with PDA affirmed by Fourier transform infrared (FTIR) spectroscopy, solid-state 13 C nuclear magnetic resonance ( 13 C NMR), X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM). The molecular weight of all copolymers is reduced by several orders of magnitude relative to pure PANI nanofibers confirmed by gel permeation chromatography (GPC). The resistivity variations for the copolymers of aniline with different types of PDAs are well explained from the point view of their molecular structures based on the first-principle simulations (i.e. intrachain electrical conductivity) and degree of crystallinity gained from XRD (i.e. interchain electrical conductivity). A tunable room-temperature magnetoresistance (MR) and a controllable negative permittivity are discovered in the copolymers of aniline with different types and contents of PDAs. This work provides a new insight for the manipulation of electrical transport for PANI nanofibers and helps seek the new applications of conductive polymer .
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Electronic Materials
·
2025
·
IF 5.3
Mingxing Cao,Zhigao Zhang,Jian He,Ruifen Hou,Wenjie Gong,Zhihong Wang
Tungsten telluride (WTe 2 ) and silver telluride (Ag 2 Te) are recently developed magnetoresistive materials, and bulk composites of these materials would be extremely advantageous in improving the magnetoresistance characteristics of the individual components and expanding their applications. In this study, previously developed synthesis methods for WTe 2 and Ag 2 Te are applied to effectively engineer WTe 2 and Ag 2 Te bulk composites. Introducing 10% Ag 2 Te in the WTe 2 matrix improves the magnetoresistance and lowers the critical magnetic field and higher onset temperature relative to those of pure-phase WTe 2 . The relationship between the magnetoresistance performance and Ag 2 Te content is further explored using simulations. The onset temperature and critical magnetic field follow the Kohler rule based on resistance calculations. The excellent composite magnetoresistance of these materials will find applications in the field of electronics.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 2
·1-13
·
IF 23.2
Guo Jiang,Xi Shaohua,Sun Yukun,Dong Wenhao,Asiri Yazeed M.,Alqarni Nawal D.,Helal Mohamed H.,Zhou Fujian,Zhu Jianfeng
In this work, magnetoresistive nanomagnetite@polyaniline (Fe 3 O 4 @PANI) composites with a core-shell structure were prepared by in situ polymerization method with KH-550 as coupling agent. All the samples demonstrated the positive MR, and compared with PANI composites reinforced with small (diameter 80 nm) size or large (diameter 450 nm) size of Fe 3 O 4 , the PANI composites reinforced with medium (diameter 220 nm) size of Fe 3 O 4 exhibit the largest MR (8.41%) when the MK-F loading is 60 wt%. Moreover, the size effect of Fe 3 O 4 particles on the electrical conductivity and MR behavior was analyzed by the Mott VRH model and wave functional shrinkage model. The MR value of Fe 3 O 4 @PANI composites with different loading and size of Fe 3 O 4 particles mainly depends on localization length, density of state at Fermi level, and average hopping length. Moreover, the Fe 3 O 4 @PANI composites were systematically characterized by SEM, TEM, XRD, and FT-IR. This work could provide the guidance for fabrication of magnetic field sensors and information memory storage devices. Graphical Abstract The core-shell structured magnetite/polyaniline nanocomposites with tunable magnetoresistance by changing the size of magnetite nanoparticle.
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
·
2021
·Vol. 32
·期 13
·18397-18407
·
IF 2.478
Gao Yan,Li Ling,Li Yule,Yang Sheng’an,Ma Ji,Li Yingjuan,Qi Longfei,Yang Yunrui,Wu Dingzhang,Zhang Hui,Chen Qingming
Doping is a primary method to improve the temperature coefficient of resistance ( TCR ) and magnetoresistance ( MR ) of La 1- x A′ x MnO 3 polycrystalline in a low magnetic field. La 0.7 Ca 0.3- x Na x MnO 3 ( x = 0, 0.02, 0.04, 0.06, 0.08) series of polycrystalline were synthesized by the sol–gel method. X-ray diffraction patterns indicate that the crystal structure changes from orthorhombic to rhombohedral, and the space group changes from Pnma to \(\text{R}\stackrel{\mathrm{-}}{\text{3}}\text{c}\) with increasing x . With Na-doping rise, the increase in grain size reduces grain boundaries, weakening the electron scattering at grain boundaries and decreasing the peak resistivity. The excellent MR (59.51%) is observed in La 0.7 Ca 0.24 Na 0.06 MnO 3 at the 1 T magnetic field. Meanwhile, TCR max reaches 12.36% K −1 in the absence of a magnetic field. The resistivity variation with temperature curve fitting illustrates that grain boundary scattering dominates in the low-temperature stage, and the effect of activation energy dominates in the high-temperature stage.
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 MAGNETISM AND MAGNETIC MATERIALS
·
2018
·
IF 3.046
Jin-Xia Sui,Xiao-Xiong Wang,Chao Song,Qi Liu,Feng Yuan,Yun-Ze Long
We systematically studied the structure, magnetism, resistance, magnetoresistance (MR) and nonlinear current-voltage (I-V) curves of La 0.33 Pr 0.34 Ca 0.33 MnO 3 (LPCMO) nanofibers via electrospinning and followed calcination. Magnetic study shows that this nanosystem can form long-range order and generate spin-glass states at low temperatures. The resistance and MR studies indicate the presence of metal insulator transitions and colossal MR effects in the system, respectively. One-dimensional variable range hopping (1D VRH) model is used to explain the high-temperature segment behavior of resistance and MR. The behavior of the nonlinear I-V curves indicates the exist of threshold voltage and zero bias conductance at low temperatures in the LPCMO nanowires, which represents the existence of Coulomb gap.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
产品关联
DOI
高影响因子
Tungsten
·
2020
·Vol. 2
·期 3
·251-260
·
IF 0
Liu Xiao-Lei,Wang Hong-Yuan,Su Hao,Yu Zhen-Hai,Guo Yan-Feng
The intriguing quasiparticles in solids, known as Dirac, Weyl, and Majorana fermions, etc. with properties akin to those theoretically predicted but never realized in high-energy physics, have excited intensive research activities in recent years. The transition metal dipnictides are attractive because of their extremely large magnetoresistance that is usually attributed to the carrier compensation effect. We briefly review herein the crystal growth, magneto-transport measurements, and theoretical studies of tantalum dipnictides TaAs 2 and TaP 2 , with the emphasis being put on discussion of the nontrivial topological states in both materials. The analysis of quantum oscillations of the magnetoresistance unveils nonzero Berry phase. The chiral negative longitudinal magnetoresistance further points to possible Weyl state, which was recently theoretically suggested as the result of the magnetic field-induced Zeeman splitting effect no matter how large the field is. The analysis of these intriguing behaviors could brush up our understanding about the family of materials and would be valuable for future work on investigating the magnetic field-induced topological phase transition in such semimetals.
研究领域:
凝聚态物理
·
材料科学
✓ 已验证
DOI
ACS Nano
·
2018
·
IF 13.709
Jun Li,Qi Pei,Ruyi Wang,Yong Zhou,Zhengming Zhang,Qingqi Cao,Dunhui Wang,Wenbo Mi,Youwei Du
The promotion of magnetic field on catalytic performance has attracted extensive attention for a long time, and substantial improvements have been achieved in some catalysis fields. However, because the Zeeman energy is several orders of magnitude weaker, magnetic field seems unable to alter the band structure and has a negligible effect on semiconductor photocatalytic performance, which makes this task a great challenge. On the other hand, the spin-related behavior usually plays an important role in determining catalytic performance. For example, in some molecular catalysis, such as photosystem II, ferromagnetic alignment of the active material results in spin-oriented electrons, which are selected and accumulated at the interface, leading to great promotion of the oxygen evolution reaction activity. Here, we propose a magnetoresistance-related strategy to boost the carrier transfer efficiency and apply it in α-Fe2O3/reduced graphene oxide hybrid nanostructures (α-Fe2O3/rGO) to improve the photocatalytic performance under magnetic field. We show that both the degradation rate constant and photocurrent density of α-Fe2O3/rGO can be dramatically enhanced with the application of magnetic field, indicating the promotion of the photocatalytic performance.
研究领域:
材料科学
·
催化化学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiaohan Yu,Shuaizhao Jin,Xiaoli Guan,Yixin Yan,Kaikai Wu,Liming Zhao,Xiang Liu
La 1- x A x MnO 3 (A = alkaline-earth or alkali metal) perovskites with large temperature coefficient of resistivity ( TCR ) offer immense opportunity for the application in high-performance infrared bolometer. However, numerous studies have revealed that the manganite films with large TCR values are not easily obtained by various fabrication technologies. Herein, a facile sol-gel spin-coating technique was used to prepare La 1- x Ca x MnO 3 (LCMO, 0.280 ≤ x ≤ 0.375) films. All the samples were highly oriented along the out-of-plane direction of La 0.3 Sr 0.7 Al 0.65 Ta 0.35 O 3 (001) substrates. With the rise in Ca doping amount, the resistivity of the films first decreased, and then, increased. This change can be attributed to the competition between the carrier concentration and lattice distortion. The LCMO films displayed large TCR and low-field magnetoresistance ( MR ) values, which exceeded those of previously reported thin films. The maximum TCR and low-field MR values were observed at x = 0.330, reaching 30.13% K −1 (266.43 K) and 68.6% (270.08 K), respectively. The La 0.67 Ca 0.33 MnO 3 film with large TCR and MR values presents potential for the applications in high-sensitivity infrared bolometers and magnetic sensors.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Huanzhi Chen,Zongkui Tian,Xilong Zhou,Xiulian Fan,Zian Li,Cheng Li,Chenyang Niu,Wenlong Chu,Yuqi Zhou,Liqi He,Yumeng Yang,Zheng Peng,Yu Zhou
Large non-saturated magnetoresistances of semimetals are dominated by charge compensation due to their unique electronic structure. However, the dramatic magnetoresistance deteriorations are often observed in low-dimensional system resulting from high-density surface defects, where the suppression of charge scattering or concentration unbalance with highly maintained magnetoresistance is still challenging. Herein, a hydrogen annealing strategy is developed for surface defects passivation of 2D MoO 2 nanoflakes. Systematical characterization for H-MoO 2 nanoflakes reveals the formation of hydrogen chemical bonds that reduce surface defect density and slightly change Fermi level with unchanged bulk structures. An obviously enhanced magnetoresistance of 9.2% is demonstrated for H-MoO 2 nanoflakes compared to Ar-MoO 2 of 3.9% at 10 K and 9 T. The analysis of the nonlinearity Hall resistivity unravels the concentration of electrons and holes in H-MoO 2 approaches a more balanced equilibrium, which is attributed to surface defects passivation resulting in the suppression of self-doping effects for enhanced magnetoresistance rather than the reduced charge scattering with slightly enhanced carrier mobility. The research not only provides a universal surface passivation strategy on 2D nonlayered semimetals for approaching the charge compensation limit with the preserved magnetoresistance but also underscores the significance of surface passivation in tuning electronic structures of 2D nonlayered materials.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）