PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2018
·Vol. 20
·期 25
·17245-17252
·
IF 3.906
Tao Wang,Zhong-Zhi Luan,Jing-Yuan Ge,Ling Liu,Di Wu,Zhong-Peng Lv,Jing-Lin Zuo,Shouheng Sun
We report a strategy to enhance the room temperature low-field magnetoresistance (LFMR) behavior of Fe3O4 nanoparticle (NP) assemblies by controlled Zn-substitution. The Zn-substituted 7 nm ZnxFe3−xO4, (x = 0 to 0.4) NPs are prepared by thermal decomposition of metal acetylacetonates (M(acac)n, M = Fe2+, Fe3+, and Zn2+). The substitution increases NP magnetic susceptibility (χ) and makes the magnetic moment more sensitive to low magnetic fields. As a result, the Zn0.3Fe2.7O4 NP assembly with NPs separated by tridecanoate exhibits a large magnetoresistance (MR) ratio of −14.8% at 300 K under a 4.5 kOe magnetic field. The demonstrated approach to control NP substitution to enhance low-field magnetoresistance of the NP assemblies provides an attractive new strategy to fabricate Fe3O4-based magnetic NP assemblies with desirable transport properties for sensitive spintronic applications.
研究领域:
材料科学
·
纳米技术
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 28
·2202143
·
IF 19.924
Wei Liu,Zhaohui Wang,Jinhua Wang,Hui Bai,Zhi Li,Jinchang Sun,Xingyuan Zhou,Jiangfan Luo,Wei Wang,Cheng Zhang,Jinsong Wu,Yan Sun,Zengwei Zhu,Qingjie Zhang,Xinfeng Tang
Unsaturated and extremely large magnetoresistance (MR), as well as the giant Nernst effect, are intriguing transport phenomena in Weyl semimetals, which are technically appealing for potential applications in magneto-electric sensors and transverse thermoelectric conversion. The prominent properties are originated from Weyl semimetal states, i.e., the coexistence of electron and hole pockets combined with linear band dispersion. However, previous studies have been focused on small-sized single crystals, rendering the practical applications of Weyl semimetals. Here, it is reported an unsaturated, quasi-linear MR as well as a very large Nernst power factor PF xy in the prepared centimeter-sized and polycrystalline Weyl semimetal NbP. An extraordinary MR of ≈2 × 10 4 % is observed below 60 K with a magnetic field up to 55 T and persists to elevated temperatures. The unusual quasi-linear MR behavior is explained by the theory of classical linear MR arising from structural disorder. The polycrystalline NbP exhibits state-of-the-art PF xy that reaches a maximum value of 74.81 μW cm –1 K –2 at 9 T and 220 K, which is 1.5 times larger than its longitudinal thermoelectric power factor PF xx . Given that polycrystalline Weyl semimetal, NbP is suitable for large-scale production, the results pave the way for its practical applications in magneto-electric sensors and transverse thermoelectric conversion.
研究领域:
凝聚态物理
·
材料科学
·
量子输运
·
热电学
·
磁电子学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-9
·
IF 14.919
Cheng Erjian,Xia Wei,Shi Xianbiao,Fang Hongwei,Wang Chengwei,Xi Chuanying,Xu Shaowen,Peets Darren C.,Wang Linshu,Su Hao,Pi Li,Ren Wei,Wang Xia,Yu Na,Chen Yulin,Zhao Weiwei,Liu Zhongkai,Guo Yanfeng,Li Shiyan
The nature of the interaction between magnetism and topology in magnetic topological semimetals remains mysterious, but may be expected to lead to a variety of novel physics. We systematically studied the magnetic semimetal EuAs 3 , demonstrating a magnetism-induced topological transition from a topological nodal-line semimetal in the paramagnetic or the spin-polarized state to a topological massive Dirac metal in the antiferromagnetic ground state at low temperature. The topological nature in the antiferromagnetic state and the spin-polarized state has been verified by electrical transport measurements. An unsaturated and extremely large magnetoresistance of ~2 × 10 5 % at 1.8 K and 28.3 T is observed. In the paramagnetic states, the topological nodal-line structure at the Y point is proven by angle-resolved photoemission spectroscopy. Moreover, a temperature-induced Lifshitz transition accompanied by the emergence of a new band below 3 K is revealed. These results indicate that magnetic EuAs 3 provides a rich platform to explore exotic physics arising from the interaction of magnetism with topology.
研究领域:
凝聚态物理
·
材料科学
✓ 已验证
DOI
高影响因子
SENSORS
·
2018
·Vol. 18
·期 6
·1765
·
IF 2.475
Zhen Yang,Huanhuan Wang,Pengfei Guo,Yuanyuan Ding,Chong Lei,Yongsong Luo
Cardiac biomarkers (CBs) are substances that appear in the blood when the heart is damaged or stressed. Measurements of the level of CBs can be used in course of diagnostics or monitoring the state of the health of group risk persons. A multi-region bio-analytical system (MRBAS) based on magnetoimpedance (MI) changes was proposed for ultrasensitive simultaneous detection of CBs myoglobin (Mb) and C-reactive protein (CRP). The microfluidic device was designed and developed using standard microfabrication techniques for their usage in different regions, which were pre-modified with specific antibody for specified detection. Mb and CRP antigens labels attached to commercial Dynabeads with selected concentrations were trapped in different detection regions. The MI response of the triple sensitive element was carefully evaluated in initial state and in the presence of biomarkers. The results showed that the MI-based bio-sensing system had high selectivity and sensitivity for detection of CBs. Compared with the control region, ultrasensitive detections of CRP and Mb were accomplished with the detection limits of 1.0 pg/mL and 0.1 pg/mL, respectively. The linear detection range contained low concentration detection area and high concentration detection area, which were 1 pg/mL–10 ng/mL, 10–100 ng/mL for CRP, and 0.1 pg/mL–1 ng/mL, 1 n/mL–80 ng/mL for Mb. The measurement technique presented here provides a new methodology for multi-target biomolecules rapid testing.Keywords:myoglobin;C-reactive protein;Dynabeads;magnetoimpedance;microfluidic device
研究领域:
生物医学工程
·
诊断学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Electronic Materials
·
2021
·Vol. 7
·期 12
·2000893
·
IF 7.295
Mingxing Cao,Zhihong Wang,Liwen Ma,Liwen Zhang,Man Wang,Yangsi Liu,Jian He,Xiaoli Xi
Tungsten ditelluride (WTe 2 ) is arising as an attractive material in magnetoresistance (MR) properties filed. The magnetoresistance properties of WTe 2 makes it an ideal material for its magnetoresistive heads of computer and magnetic sensor device applications. So far, people have developed various controlled synthesis methods to produce large-quantity uniform flat WTe 2 crystals. Nevertheless, none of the methods are sustainable, some methods use reducing gases, and some use very long heat preservation, and the process is very complicated. Here, a mild and fast self-flux method is described for WTe 2 synthesis that can avoid producing reducing gases. After conducting structural and physical tests, it is found that annealing time is critical for WTe 2 structure formation. Long annealing time improves the crystallinity of WTe 2 and makes its texture more obvious, increasing the conductivity of WTe 2 . Therefore, it will lead to the anomalous nonsaturating positive magnetoresistance with different field dependent behaviors, reaching the ultrastrong magnetoresistive value of 1040% at 5 K and 14 T. The results provide a sustainable approach for uniform WTe 2 crystal synthesis, which will benefit the large-quantity production of WTe 2 magnetoresistive materials.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Songrong Cheng,Men Shao,Ke Wang,Peilun Shen,Hao Duan,Lu Li,Baokang Hou,Xin You,Huaming Deng,Kaizhao Wang,Jin Hu,Rui Chen,Qingming Chen,Sheng'an Yang,Ji Ma
Polycrystalline La 0.67 Ca 0.33 MnO 3 films were fabricated by spin–coating, exhibiting strong structural anisotropy, along with excellent anisotropic magnetoresistance (AMR) and temperature coefficient of magnetoresistance (TCM) properties. These films show potential as materials for angle sensors in consumer electronics. The crystallinity and interface matching of La 0.67 Ca 0.33 MnO 3 films are closely linked to sintering conditions. Enhanced crystallization promotes better grain orientation, grain boundary connectivity, and lattice anisotropy, ultimately leading to improved physical properties. That is, the optimized sintering temperature of 1100 °C led to best grain boundary connectivity, resulting in −19.8 % AMR at 1T and 26.7 % TCM at 0.1T near room temperature (≈270 K). A comparative analysis of temperature, magnetic field, and performance demonstrates that the sample achieves the best AMR performance (0–1 T magnetic field, response temperature close to room temperature) compared to existing literatures. Additionally, significant magnetic anisotropy was observed, with the magnetic susceptibility anisotropy enhanced by a factor of three near the Curie temperature. Curie–Weiss fitting showed that films with optimal crystallinity exhibited significant differences between the in–plane and out–of–plane effective magnetic moments, while films with poorer crystallinity showed minimal differences, indicating that structural anisotropy underlies the anisotropy in magnetic properties.
研究领域:
材料科学
·
凝聚态物理
·
薄膜技术
·
磁阻效应
·
自旋电子学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2023
·Vol. 6
·期 2
·1-12
·
IF 20.1
Zeng Junling,Xie Wenhao,Zhou Heng,Zhao Tong,Xu Ben Bin,Jiang Qinglong,Algadi Hassan,Zhou Zhenyu,Gu Hongbo
Herein, a nitrogen-doped graphite-like carbon material derived from hybrid phthalonitrile (PN) resin with controllable carbon microstructures including crystalline structures, hybridized carbon configurations, degree of disorder, and nitrogen species such as pyridinic N, pyrrolic N, and graphitic N has been manufactured by high-temperature annealing method. By simply altering these carbon microstructures through annealing temperature, the lowest resistivity of 1.76 Ω·cm at 290 K, the negative MR value of − 6.10% at a magnetic field of 9 T and negative permittivity over − 10 5 at low frequency are achieved in the semiconducting nitrogen-doped graphite-like carbon material. The results confirm the decreasing degree of disorder attained from Raman spectroscopy, the increasing ratio of sp 2 and sp 3 hybridized carbon, i.e., C( sp 2 )/C( sp 3 ), from X-ray photoelectron spectroscopy (XPS), and the rise of charge carrier mobility with increasing the magnetic field from Hall-effect measurement is responsible for the negative MR effect in this nitrogen-doped graphite-like carbon material. The negative permittivity is attributed to the plasma oscillation with delocalized charge carriers by the Drude model and the greatly increasing graphitic N in the carbon microstructures. This work opens a new insight for the applications of carbonized PN resins in the electronic device field.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2025
·Vol. 8
·期 2
·1-11
·
IF 21.8
He Qin-yu,Chen Fu-ming,Hu Shu-ting,Zhai Wangjian,Tang Zhilie
Current heavy-metal wastewater treatment methods face significant limitations, creating a need for new technologies. Zero-valent iron (ZVI) shows potential, but the core-shell structure of ZVI is an obstacle due to the low electrical conductivity ( σ ) of its shell, limiting electron transfer from the core to the surface for metal removal reactions. In this study, we enhance the shell’s σ in a pre-magnetized decimeter-sized ZVI plate (MMDZVIP) through reinforced negative magnetoresistance (NMR) effect. Magnetoresistance measurements reveal that MMDZVIP exhibits an NMR effect. MMDZVIP shows a magnetoresistance ratio ( MR ) of -123%, an σ 1.95 times and removal efficiencies 1.91 to 5.18 times that of unmagnetized plates when magnetized to 449 mT. Heavy-metal removal experiments showed nearly 100% removal efficiency at 354 mT, with performance retention above 99.7% after 9 cycles, demonstrating high durability. The mechanism behind the results is as follows: During the removal process, the migration of releasing electrons is aligned to form a current along the normal direction of the MMDZVIP plate. This current is primarily driven by electron consumption on the plate’s surface, where the removal reaction occurs. With pre-magnetization, NMR and Hall effects acted on the releasing electron current and synergistically and significantly enhance the shell's σ . Our work introduces a novel method for enhancing NMR in materials, advancing heavy-metal treatment technologies beyond current limitations.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Superconductivity and Novel Magnetism
·
2021
·Vol. 34
·期 10
·2565-2572
·
IF 1.506
Zhao Caiye,Yi Xiaolei,Hou Qiang,Feng Jiajia,Zhang Yufeng,Xu Mingxiang,Shi Zhixiang
In this work, a series of FeS 1- x Te x (0 ≤ x ≤ 0.15) single crystals were successfully synthesized by a hydrothermal method for the first time. According to the measurement of in-plane resistivity, Hall effect, and magnetoresistance (MR), we find that the superconducting transition temperature T c is rapidly suppressed with the increasing Te substitution, and finally the superconductivity disappears when x > 0.05. With the substitution of Te for S, the residual resistivity ρ 0 increases while the residual resistivity ratio (RRR) decreases monotonously. Meanwhile, the MR of FeS 1- x Te x is also reduced by Te doping. All these results reveal that the Te substitution introduces more impurity scattering. In consequence, the non-linear field-dependent of Hall resistivity ρ xy at low temperature region is suppressed and a linear behavior is restored upon Te doping. The negative Hall coefficients R H for all the FeS 1- x Te x samples suggest that the electron-type carrier dominates the electrical conduction. Moreover, the MR of FeS 1- x Te x obviously follows Kohler’s law, indicating the isotropic scattering rates in the Fermi surface.
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
BIOSENSORS & BIOELECTRONICS
·
2014
·
IF 6.451
Tao Wang,Zhen Yang,Chong Lei,Jian Lei,Yong Zhou
A Dynabeads-labeled magnetic immunoassay (MIA) has been developed by using an integrated giant magnetoimpedance (GMI) biosensor for the detection of alpha-fetoprotein (AFP). The GMI biosensor (Cr/Cu/NiFe/Cu/NiFe/Al 2 O 3 /Cr/Au films) integrated magnetic sensing elements and a biomolecular immunoplatform. Au film was modified with 11-Mercaptoundecanoic acid (11-MUA) for the immobilization of AFP monoclonal antibody . Double antibody sandwich immunoassay was used to specifically capture and label AFP antigen. Functionalized Dynabeads were conjugated to AFP antigen by streptavidin–biotin binding assay. GMI responses were measured for sensitive detection of AFP from 1 to 10 ng/ml. Our results revealed that the presence of AFP on the biosensor improved the GMI effect owing to the induced magnetic dipole of superparamagnetic Dynabeads, and the GMI ratio was greatly increased at high frequency. Specificity of MIA was tested through the use of 1% bovine serum albumin (BSA). The underlying biophysical mechanisms responsible for the enhanced GMI effect in the detection of AFP were discussed. This work provides a complex lab-on-chip MIA for the detection of biomarker, which may open up a new way for the development of GMI-based MIA in clinical trials .
研究领域:
生物医学工程
·
分子诊断学
✓ 已验证
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 29
·5045-5052
·
IF 3.545
Shulong Zhang,Mingtao Li,Yilun Yang,Chengchun Zhao,Mingzhu He,Yin Hang,Yifei Fang
CeSb2 is a homologue of rare-earth diantimonides. This work reports a systematic study of a series of high-quality single crystals of CeSb2 grown by a self-flux method, which is a heavy fermion Kondo metal with intricate magnetic transitions. We have grown four types of crystals with different initial material ratios in order to investigate the effect of growth conditions on the quality of the as-grown crystals. The phase purity, morphology and composition of the synthesized samples were studied with X-ray diffraction, scanning electron microscopy, electron-probe microanalysis, and Raman-scattering spectroscopy to evaluate their quality. It is found that an inappropriate raw material ratio will lead to the inhomogeneity and poor crystallinity of the as-grown crystal. In addition, the electrical transport properties of the as-grown crystals were measured, from which the residual resistivity ratios were extracted to further examine the homogeneity and crystalline quality. Furthermore, the magnetoresistance properties of CeSb2 were observed. Through a systematic study on CeSb2, the most suitable starting ratio for the growth of CeSb2 was obtained, which might serve as a guide for the growth of other light rare-earth diantimonides.
研究领域:
材料科学
·
凝聚态物理
·
晶体生长
·
磁性材料
·
强关联电子体系
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 103
·期 3
·799-806
·
IF 2.606
Wang Haishan,Ling Fuxin,Li Yule,Wu Dingzhang,Qi Longfei,Liang Zhaowei,Chen Qingming,Zhang Hui
La 0.825 Sr 0.175 Mn 1− x V x O 3 ( x = 0.00–0.05) ceramics were prepared by sol–gel method. X-ray diffraction analysis illustrates that all samples are perovskite structure, no impurity phases were detected. SEM shows that the grains are closely connected. With increasing V doping level, the grain size decreased from 27.78 μm ( x = 0.00) to 11.23 μm ( x = 0.05), which results into the enhancement of grain boundary effect. The temperature dependence of resistivity shows that all samples exhibit typical insulator-metal transition. With V doping up to 0.01, temperature coefficient of resistivity ( TCR ) increases from 4.65% K −1 to 6.1% K −1 , and the magnetoresistance ( MR ) value reaches 38.629%. The electrical and the magnetic properties of V-doped La 0.825 Sr 0.175 MnO 3 present a complicated behavior with further doping of V. These findings indicate that the properties of manganites can be effectively and dramatically tailored by doping of Mn, which meantime facilitate the application of manganites in infrared detector and magnetic sensors.
Graphical abstract
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）