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382 results on '"Che, Shenglei"'

107. Enhanced Stress Stability in Flexible Co/Pt Multilayers with Strong Perpendicular Magnetic Anisotropy

Author

Li, Mengchao, Yang, Huali, Xie, Yali, Huang, Kai, Pan, Lili, Tang, Wei, Bao, Xilai, Yang, Yumeng, Sun, Jie, Wang, Xinming, Che, Shenglei, and Li, Run-Wei

Abstract

Due to the magnetoelastic coupling, the magnetic properties of many flexible magnetic films (such as Fe, Co, and Ni) are sensitive to mechanical stress, which deteriorates the performance of flexible magnetoelectronic devices. We show that by stacking Co and Pt alternatively to form multilayers with strong perpendicular magnetic anisotropy (PMA), both magnetic hysteresis and magnetic domain measurements reveal robust PMA against external stress. As the PMA weakens at increased Co thickness, the magnetic anisotropy is vulnerable to external stress. These results were understood based on a micromagnetic model, which suggests that the strength of magnetoelastic anisotropy with respect to initial effective magnetic anisotropy affects the stress-stability of the film. Although the stress coefficient of magnetoelastic anisotropy is enhanced at reduced Co thickness, the concomitant increase of initial effective magnetic anisotropy guarantees a robust PMA against external stress. Our results provide a route to constructing flexible magnetoelectronic devices with enhanced stress stability.

Published
2023
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111. H2O2-replenishable and GSH-depletive ROS ‘bomb’ for self-enhanced chemodynamic therapy

Author

Zhao, Fan, primary, Yao, Jiayu, additional, Tong, Yu, additional, Su, Dan, additional, Xu, Qing, additional, Ying, Yao, additional, Li, Wangchang, additional, Li, Juan, additional, Zheng, Jingwu, additional, Qiao, Liang, additional, Cai, Wei, additional, Mou, Xiaozhou, additional, Che, Shenglei, additional, Yu, Jing, additional, and Hou, Yanglong, additional

Published
2022
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114. Effect of a YIG nanoparticle additive on the magnetic properties of MnZn ferrites for MHz frequency applications.

Author

Ying, Yao, Feng, Jiawei, Li, Zhaocheng, Zheng, Jingwu, Yu, Jing, Li, Wangchang, Qiao, Liang, Cai, Wei, Li, Juan, Huang, Hui, Zhao, Tiejun, and Che, Shenglei

Subjects
MAGNETIC properties, YTTRIUM iron garnet, EDDY current losses, FERRITES, MAGNETIC nanoparticles, CRYSTAL grain boundaries
Abstract

In this study, MnZn ferrites with added YIG nanoparticles were developed for MHz frequency applications. The effect of the magnetic YIG additive on the power loss, initial permeability, and cutoff frequency of MnZn ferrites was investigated. A small quantity of added YIG effectively reduces the power loss and concurrently increases the initial permeability. Compared to the results for the MnZn ferrite with no added YIG, the optimal MnZn ferrite with 600 ppm added YIG exhibits a reduction in the power loss at 25°C of 56.4% and 36.6% at 1 MHz/50 mT and 3 MHz/10 mT, respectively, and a 13.9% increase in the initial permeability. This sample also exhibits a good stability of the power loss against temperature. The power loss remains below 205 kW/m3 over temperatures ranging from 25 to 140°C. The effect mechanism of YIG addition on the magnetic properties of MnZn ferrites was studied. An analysis based on the equivalent circuit model showed that the reduction in the eddy current loss and power loss mainly results from the increase in the grain boundary resistance caused by the addition of highly resistive YIG. [ABSTRACT FROM AUTHOR]

Published
2023
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115. Magnetic Properties and Microstructure of Ce-Cu-Al Low Melting Alloy Bonding Sm 2 Fe 17 N 3 Magnet Fabricated by the Hot-Pressing Method.

Author

Zheng, Jingwu, Yu, Shitong, Huang, Heng, Li, Rongyao, Cai, Wei, Chen, Haibo, Li, Juan, Qiao, Liang, Ying, Yao, Li, Wangchang, Yu, Jing, and Che, Shenglei

Subjects
MAGNETIC properties, ALLOY powders, MAGNETS, ALLOYS, MELTING points, RARE earth metal alloys, RARE earth metals
Abstract

Sm2Fe17N3 compounds, having excellent intrinsic magnetic properties, are prone to decomposition at high temperatures; thus, a low melting point metal binder is the key to prepare high performance bulk magnets at low temperatures. In this paper, a new low melting point alloy Ce72Cu28-xAlx was used as the binders, and high-performance Ce-based alloy bonding Sm2Fe17N3 magnets were realized by the hot-pressing method. The experimental results demonstrated that the content of Al in the Ce-based alloys had an important influence on the performance of the magnets. High performance Sm-Fe-N bonded magnets with remanence of 10.19 KGs and maximum magnetic energy product of 21.06 MGOe were achieved by using 5 wt.% Ce72Cu22Al6 alloy as a binder. At the same time, it was found that the Ce72Cu28-xAlx alloy has a lower density and better bonding effect than the common Zn binder. Its bonding magnets still have higher performance even with extremely high oxygen content. Therefore, Ce72Cu28-xAlx alloy with low melting point is a promising new rare earth-based alloy binder. If the oxygen content of the alloy powders could be reduced, higher performance Sm2Fe17N3 bonded magnets can be prepared. [ABSTRACT FROM AUTHOR]

Published
2022
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116. Injection Molding and Sintering of ZrO 2 Ceramic Powder Modified by a Zirconate Coupling Agent.

Author

Mao, Qiangyi, Qiao, Liang, Zheng, Jingwu, Ying, Yao, Yu, Jing, Li, Wangchang, Che, Shenglei, and Cai, Wei

Subjects
CERAMIC powders, INJECTION molding of ceramics, SINTERING, POWDERS, BENDING strength, INJECTION molding, SURFACE morphology
Abstract

Ceramic injection molding is a near-net shape-processing technique, producing ceramic components with low tooling costs and complex shapes. In this paper, ZrO2 ceramics with high loading content in the green part were prepared by powder modification using zirconate coupling agent, injection molding and sintering, which benefited decreasing the usage of binders and deformation of ceramics. The rheological characteristics of feedstocks, densities, microstructures and mechanical properties of green and sintered parts with the different coupling media and sintering temperatures were studied. The results showed that the addition of a zirconate coupling agent with ethanol medium obviously increased the flowability of feedstocks and benefited achieving the green parts with high powder loading (86.5 wt.%) and bending strength (12.9 MPa) and the final unbroken ceramics. In addition, the sintering temperatures from 1500–1575 °C had no significant effects on the density, hardness, and surface morphology of the ceramic samples. However, the bending strength increased and some large grains with transgranular fracture occurred on the fractural surface at the sintering temperature of 1575 °C. [ABSTRACT FROM AUTHOR]

Published
2022
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117. Hypoxia-Overcoming Breast-Conserving Treatment by Magnetothermodynamic Implant for a Localized Free-Radical Burst Combined with Hyperthermia

Author

Lu, Jingsong, primary, Guo, Zhenhu, additional, Xie, Wensheng, additional, Chi, Yongjie, additional, Xu, Wanling, additional, Guo, Xiaoxiao, additional, Gao, Xiaohan, additional, Ye, Jielin, additional, Xu, Benhua, additional, Zheng, Rong, additional, Sun, Xiaodan, additional, Wang, Xiumei, additional, Che, Shenglei, additional, Yu, Jing, additional, and Zhao, Lingyun, additional

Published
2021
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120. Phase, microstructure and sintering of aluminum nitride powder by the carbothermal reduction-nitridation process with Y2O3 addition

Author

Ying Yao, Li Wangchang, Zheng Jing-wu, Che Shenglei, Fu Li, Yu Jing, and Qiao Liang

Subjects
010302 applied physics, Materials science, Metallurgy, chemistry.chemical_element, Sintering, 02 engineering and technology, Carbon black, Yttrium, Nitride, 021001 nanoscience & nanotechnology, Microstructure, 01 natural sciences, chemistry, Chemical engineering, Carbothermic reaction, visual_art, 0103 physical sciences, Materials Chemistry, Ceramics and Composites, visual_art.visual_art_medium, Orthorhombic crystal system, Ceramic, 0210 nano-technology
Abstract

Aluminum nitride powders were synthesized by carbothermal reduction-nitridation method using Al(OH) 3 , carbon black and Y 2 O 3 as raw materials. The change of phase, microstructure and densification during the AlN synthesis and sintering process were investigated and the effects of Y 2 O 3 was discussed. The results showed that Y 2 O 3 reacted with Al 2 O 3 to form yttrium aluminates of YAlO 3 (orthorhombic and hexagonal phases), Y 4 Al 2 O 9 and Y 3 Al 5 O 12 at the low temperature of 1350 °C. YAlO 3 could firstly be transformed into Y 2 O 3 and then completely into YN when the firing temperature and holding time increased. However, YN could be oxidized into Y 2 O 3 again after the carbon removal at 700 °C in the air atmosphere. There were two ways generating AlN when adding Y 2 O 3 and the possible mechanism was proposed. Y 2 O 3 from YN oxidation favored the densification of AlN ceramics because the liquid had better flowability and distribution in the sintering process at 1800 °C.

Published
2018

121. H2O2-independent chemodynamic therapy initiated from magnetic iron carbide nanoparticle-assisted artemisinin synergy

Author

Zhao, Fan, primary, Yu, Jing, additional, Gao, Weiliang, additional, Yang, Xue, additional, Liang, Liying, additional, Sun, Xiaolian, additional, Su, Dan, additional, Ying, Yao, additional, Li, Wangchang, additional, Li, Juan, additional, Zheng, Jingwu, additional, Qiao, Liang, additional, Cai, Wei, additional, Che, Shenglei, additional, and Mou, Xiaozhou, additional

Published
2021
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134. Magnetic Reactive Oxygen Species Nanoreactor for Switchable Magnetic Resonance Imaging Guided Cancer Therapy Based on pH-Sensitive Fe5C2@Fe3O4 Nanoparticles

Author

Yu, Jing, primary, Zhao, Fan, additional, Gao, Weiliang, additional, Yang, Xue, additional, Ju, Yanmin, additional, Zhao, Lingyun, additional, Guo, Weisheng, additional, Xie, Jun, additional, Liang, Xing-jie, additional, Tao, Xinyong, additional, Li, Juan, additional, Ying, Yao, additional, Li, Wangchang, additional, Zheng, Jingwu, additional, Qiao, Liang, additional, Xiong, Subin, additional, Mou, Xiaozhou, additional, Che, Shenglei, additional, and Hou, Yanglong, additional

Published
2019
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136. Preparation, Microstructure, and Magnetic Properties of Electrodeposited Nanocrystalline L10 FePt Films.

Author

Ying, Yao, Wang, Huibin, Zheng, Jingwu, Yu, Jing, Li, Wangchang, Qiao, Liang, Cai, Wei, and Che, Shenglei

Subjects
MAGNETIC properties, MAGNETIC coupling, MICROSTRUCTURE, GAS mixtures, THIN films, MAGNETIC alloys, MAGNETIC films
Abstract

In this work, we prepared the nanocrystalline near-equiatomic FePt thin films by electrodeposition and explored the effects of annealing temperature and annealing time on morphology, structure, and magnetic properties of FePt film. The fcc-FePt phase starts to form when annealing at 400 °C under the 15% H2 gas mixture. With increasing annealing temperature from 400 to 800 °C, the FePt film experiences a gradual phase transformation from the soft magnetic fcc phase to the permanent magnetic fct L10 phase. The transition degree of the L10 phase is achieved to be 0.94 and coercivity reaches a maximum of 1.5 T for the sample annealed at 800 °C for 4 h. A shoulder behavior in the M(H) curves is found in the electrodeposited FePt films. Through fitting the M(H) curves by the model based on the transition degree of the L10 FePt phase, the shoulder behavior is quantitatively confirmed to originate from the coexistence of the soft magnetic fcc phase and the permanent magnetic L10 phase. The magnetic exchange coupling between the soft magnetic and permanent magnetic nanocrystalline phases is negligible in the electrodeposited FePt films due to that the substrate Ag diffusion into the FePt film separates the FePt nanocrystalline phases. [ABSTRACT FROM AUTHOR]

Published
2020
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137. Structure and Magnetic Properties of the Ti-Doped Pyrochlore Molybdate Y2Mo2(1-x)Ti2xO7.

Author

Ying, Yao, Zhang, Wei, Yu, Jing, Qiao, Liang, Zheng, Jingwu, Li, Wangchang, Li, Juan, Cai, Wei, and Che, Shenglei

Subjects
MAGNETIC structure, MAGNETIC properties, MAGNETIC transitions, PYROCHLORE, MOLYBDENUM, MAGNETIC measurements
Abstract

The structural, heat capacity, and magnetic properties of Y2Mo2(1-x)Ti2xO7 were investigated in this work. Y2Mo2(1-x)Ti2xO7 maintains the pyrochlore structure, but lattice constants are observed to decrease continuously with the Ti4+ doping. The magnetic measurements indicate a magnetic phase transition at low temperature for all Ti-doped samples, and the Ti4+ doping suppresses the transition temperature. This is ascribed to the diluted effect of nonmagnetic Ti4+ substitution of magnetic Mo4+. The heat capacity data confirm that the low-temperature magnetic phase is spin glass in the Ti4+-doped Y2Mo2(1-x)Ti2xO7 system. The M(H) data reveals the coexistence of antiferromagnetic and ferromagnetic interactions at low temperatures. [ABSTRACT FROM AUTHOR]

Published
2019
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149. Enhanced maximum energy product of (Sm1–yYy)2Fe17Nxcaused by abundant yttrium doping

Author

Xu, Jianwei, Zheng, Jingwu, Chen, Haibo, Qiao, Liang, Ying, Yao, Cai, Wei, Li, Wangchang, Yu, Jing, Lin, Min, and Che, Shenglei

Abstract

Replacement of samarium (Sm) with abundant yttrium (Y) can help solve the potential shortage of Sm in the preparation of promising Sm2Fe17Nxmagnets. In this article, phase composition, microstructure and magnetic properties of (Sm1–yYy)2Fe17Nx(y = 0, 0.2, 0.4, 0.6, 0.8, 1.0) were investigated. Maximum energy product (BH)maxis improved when less than 40 at% Y is doped in (Sm1–yYy)2Fe17Nxpowder. In particular, when 20 at% Y replaces Sm, (BH)maxof (Sm1–yYy)2Fe17Nxpowder increases by 15.1% from 131.7 to 151.6 kJ/m3. The effect of annealing temperature on the structural properties of high Y doping (Sm0.6Y0.4)2Fe17and the magnetic properties of the corresponding nitrides were subsequently investigated. In the RE2Fe17phase grain combination process, the interlaced structure of the rhombohedral Th2Zn17-type structural phase and the hexagonal Th2Ni17-type structural phase is formed. Due to short-range exchange coupling, the nitride with the highest content of two interlaced RE2Fe17phases has the highest magnetic properties: Br = 1.23 T, HcJ = 443.9 kA/m and (BH)max = 197.6 kJ/m3.

Published
2020
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150. Magnetic Exchange Interactions in Geometrically Frustrated Antiferromagnet of ZnCr2−xGaxO4.

Author

Yu, Jing, Wang, Lichao, Ying, Yao, Zheng, Jingwu, Li, Wangchang, Qiao, Liang, Cai, Wei, Li, Juan, Che, Shenglei, and Zhang, Lei

Subjects
ANTIFERROMAGNETIC materials, DOPING agents (Chemistry), EXCHANGE interactions (Magnetism), SPIN glasses, FERRIMAGNETISM, JAHN-Teller effect
Abstract

In this work, the structural and magnetic properties in ZnCr2−xGaxO4 were investigated. In ZnCr2−xGaxO4, Ga3+ ions substitute partial Cr3+ ions and occupy the B sites. ZnCr2O4 undergoes a paramagnetic-antiferromagnetic transition at 12 K. In ZnCr2−xGaxO4, the antiferromagnetic short-range correlation occurs below 60 K above T N . The Ga3+ doping weakens the antiferromagnetic nearest-neighbor exchange interaction (J1) and induces ferromagnetic next-nearest-neighbor exchange interaction (J2) among the B site magnetic ions. The generation of the ferromagnetic J2 is ascribed to structure distortion induced by the Ga3+ doping. [ABSTRACT FROM AUTHOR]

Published
2019
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