Search

Your search keyword '"Yu, Guoqiang"' showing total 1,615 results
Start Over Author "Yu, Guoqiang"
1,615 results on '"Yu, Guoqiang"'

202. Field-free magnetic switching dependence on lateral interfaces in synthetic antiferromagnets by ion implantation.

Author

Shen, Bowen, Yang, Meiyin, Li, Yanru, Yu, Peiyue, Gao, Jianfeng, Cui, Baoshan, Yu, Guoqiang, and Luo, Jun

Subjects
MAGNETIC control, ION implantation, SYMMETRY breaking, LOGIC devices, SPIN-orbit interactions, MAGNETIZATION
Abstract

Field-free spin–orbit torque switching in synthetic antiferromagnets (SAF) holds significant promise for high-density spintronic memory and logic devices. In this paper, we realize the field-free magnetization switching in SAFs due to the local ion implantation-induced 45° lateral interface and symmetry breaking. Moreover, the magnetization switching ratio is enlarged by the lateral interface owing to the superimposition of a damping-like effective field and a symmetry-breaking effective field. Our work is significant for the development of magnetic random-access memory technology with high-speed and anti-interference ability. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

203. Wafer‐Scale Epitaxial Growth of the Thickness‐Controllable Van Der Waals Ferromagnet CrTe2 for Reliable Magnetic Memory Applications.

Author

Liu, Xinqi, Huang, Puyang, Xia, Yunyouyou, Gao, Lei, Liao, Liyang, Cui, Baoshan, Backes, Dirk, van der Laan, Gerrit, Hesjedal, Thorsten, Ji, Yuchen, Chen, Peng, Zhang, Yifan, Wu, Fan, Wang, Meixiao, Zhang, Junwei, Yu, Guoqiang, Song, Cheng, Chen, Yulin, Liu, Zhongkai, and Yang, Yumeng

Subjects
MAGNETICS, FERROMAGNETIC materials, THIN films, SURFACE energy, STRUCTURAL optimization, SAPPHIRES, EPITAXY
Abstract

To harness the intriguing properties of 2D van der Waals (vdW) ferromagnets (FMs) for versatile applications, the key challenge lies in the reliable material synthesis for scalable device production. Here, the epitaxial growth of single‐crystalline 1T‐CrTe2 thin films on 2‐inch sapphire substrates are demonstrated. Benefiting from the uniform surface energy of the dangling bond‐free Al2O3(0001) surface, the layer‐by‐layer vdW growth mode is observed right from the initial growth stage, which warrants precise control of the sample thickness beyond three monolayer and homogeneous surface morphology across the entire wafer. Moreover, the presence of the Coulomb interaction at the CrTe2/Al2O3 interface plays an important role in tailoring the anomalous Hall response, and the structural optimization of the CrTe2‐based spin‐orbit torque device leads to a substantial switching power reduction by 54%. The results may lay out a general framework for the design of energy‐efficient spintronics based on configurable vdW FMs. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

204. Contributors

Author

Askar, Khalid A., primary, Bafana, Adarsh, additional, Benson, Tracy, additional, Bird, David, additional, Doan, Linh, additional, Ge, Xuehui, additional, Gendelberg, Natali, additional, Hou, Haoqing, additional, Jeffryes, Clayton, additional, Ji, Tuo, additional, Jiang, Shaohua, additional, Jin, Li, additional, Li, Weijun, additional, Lu, Yang, additional, Mehra, Nitin, additional, Mu, Liwen, additional, Popok, Vladimir N., additional, Ravindra, Nuggehalli M., additional, Rong, Min Zhi, additional, Song, Kenan, additional, Tian, Zhenhao, additional, Wang, Yujun, additional, Wei, Suying, additional, Wei, Jia, additional, Wujcik, Evan K., additional, Xu, Jianhong, additional, Xu, Quan, additional, Yang, Xing, additional, Ye, Xiao Ji, additional, Yu, Guoqiang, additional, Zhang, Ming Qiu, additional, Zhang, Lin, additional, Zhang, Wei, additional, Zhu, Jiahua, additional, and Zhu, Yong, additional

Published
2019
Full Text
View/download PDF

209. Anisotropic Interlayer Dzyaloshinskii–Moriya Interaction in Synthetic Ferromagnetic/Antiferromagnetic Sandwiches

Author

Yun, Jijun, primary, Cui, Baoshan, additional, Cui, Qirui, additional, He, Xiaodong, additional, Chang, Yuhan, additional, Zhu, YingMei, additional, Yan, Ze, additional, Guo, Xi, additional, Xie, Hongfei, additional, Zhang, Jianrong, additional, Bai, Qiaoning, additional, Zhai, Yongbo, additional, Xu, Hengyi, additional, Zuo, Yalu, additional, Yang, Dezheng, additional, Jia, Chenglong, additional, Yu, Guoqiang, additional, Wu, Hao, additional, Yang, Hongxin, additional, Xue, Desheng, additional, and Xi, Li, additional

Published
2023
Full Text
View/download PDF

211. Giant Tunneling Magnetoresistance in Spin-Filter Magnetic Tunnel Junctions Based on van der Waals A-Type Antiferromagnet CrSBr

Author

Lan, Guibin, primary, Xu, Hongjun, additional, Zhang, Yu, additional, Cheng, Chen, additional, He, Bin, additional, Li, Jiahui, additional, He, Congli, additional, Wan, Caihua, additional, Feng, Jiafeng, additional, Wei, Hongxiang, additional, Zhang, Jia, additional, Han, Xiufeng, additional, and Yu, Guoqiang, additional

Published
2023
Full Text
View/download PDF

212. Magnetization switching of a nearly compensated ferrimagnet by enhanced spin-orbit torque

Author

Zhang, Xu, primary, Wang, Xiaolu, additional, Jiang, Qisheng, additional, He, Wenqing, additional, Yang, Yongqiang, additional, Gong, Qianxun, additional, Guo, Tengyu, additional, Chen, Peng, additional, Zhang, Jing, additional, Yu, Guoqiang, additional, Han, Xiufeng, additional, Wang, Kang L., additional, Wang, Yue, additional, Cui, Baoshan, additional, and Wu, Hao, additional

Published
2023
Full Text
View/download PDF

220. Tunable Hole‐Selective Transport by Solution‐Processed MoO3− xVia Doping for p ‐Type Crystalline Silicon Solar Cells

Author

Wei, Yaju, primary, Yu, Guoqiang, additional, Luo, Guohui, additional, Fu, Wang, additional, Liu, Wuqi, additional, Wang, Tao, additional, Xu, Haonan, additional, Wu, Xiaoping, additional, Xu, Lingbo, additional, Lin, Ping, additional, Zhu, Xiaodong, additional, Yu, Xuegong, additional, Wang, Peng, additional, and Cui, Can, additional

Published
2023
Full Text
View/download PDF

221. Fermi-Level-Dependent Charge-to-Spin Conversion of the Two-Dimensional Electron Gas at the γ - Al2O3/KTaO3 Interface

Author

Zhang, Hui, primary, Zhu, Zengtai, additional, Zhu, Yungu, additional, Chen, Xiaobing, additional, Jiang, Qisheng, additional, Wei, Jinwu, additional, Zhao, Chenbo, additional, Zhang, Jine, additional, Han, Furong, additional, Yang, Huaiwen, additional, Zhu, Dapeng, additional, Wu, Hao, additional, Chen, Yuansha, additional, Hu, Fengxia, additional, Shen, Baogen, additional, Zhao, Weisheng, additional, Zhang, Jing, additional, Yu, Guoqiang, additional, and Sun, Jirong, additional

Published
2023
Full Text
View/download PDF

223. Realization of Zero‐Field Skyrmions in a Magnetic Tunnel Junction

Author

He, Bin, primary, Hu, Yue, additional, Zhao, Chenbo, additional, Wei, Jinwu, additional, Zhang, Junwei, additional, Zhang, Yu, additional, Cheng, Chen, additional, Li, Jiahui, additional, Nie, Zhuyang, additional, Luo, Yanxiang, additional, Zhou, Yan, additional, Zhang, Shilei, additional, Zeng, Zhongming, additional, Peng, Yong, additional, Coey, John Michael David, additional, Han, Xiufeng, additional, and Yu, Guoqiang, additional

Published
2023
Full Text
View/download PDF

225. Norepinephrine links astrocytic activity to regulation of cortical state

Author

Reitman, Michael E., Tse, Vincent, Mi, Xuelong, Willoughby, Drew D., Peinado, Alba, Aivazidis, Alexander, Myagmar, Bat-Erdene, Simpson, Paul C., Bayraktar, Omer A., Yu, Guoqiang, Poskanzer, Kira E., Reitman, Michael E., Tse, Vincent, Mi, Xuelong, Willoughby, Drew D., Peinado, Alba, Aivazidis, Alexander, Myagmar, Bat-Erdene, Simpson, Paul C., Bayraktar, Omer A., Yu, Guoqiang, and Poskanzer, Kira E.

Abstract

Cortical state, defined by population-level neuronal activity patterns, determines sensory perception. While arousal-associated neuromodulators-including norepinephrine (NE)-reduce cortical synchrony, how the cortex resynchronizes remains unknown. Furthermore, general mechanisms regulating cortical synchrony in the wake state are poorly understood. Using in vivo imaging and electrophysiology in mouse visual cortex, we describe a critical role for cortical astrocytes in circuit resynchronization. We characterize astrocytes' calcium responses to changes in behavioral arousal and NE, and show that astrocytes signal when arousal-driven neuronal activity is reduced and bi-hemispheric cortical synchrony is increased. Using in vivo pharmacology, we uncover a paradoxical, synchronizing response to Adra1a receptor stimulation. We reconcile these results by demonstrating that astrocyte-specific deletion of Adra1a enhances arousal-driven neuronal activity, while impairing arousal-related cortical synchrony. Our findings demonstrate that astrocytic NE signaling acts as a distinct neuromodulatory pathway, regulating cortical state and linking arousal-associated desynchrony to cortical circuit resynchronization. The authors show that norepinephrine signaling to astrocytes in the mouse visual cortex acts as a separate neuromodulatory pathway that regulates the effects of arousal on neuronal activity and cortical state.

Published
2023

226. Room temperature field-free switching of perpendicular magnetization through spin-orbit torque originating from low-symmetry type II Weyl semimetal

Author

He, Congli, Shao, Qiming, Yu, Guoqiang, He, Congli, Shao, Qiming, and Yu, Guoqiang

Abstract

Spin-orbit torque (SOT) is a promising strategy to deterministically switch the perpendicular magnetization, but usually requires an in-plane magnetic field for breaking the mirror symmetry, which is not suitable for most advanced industrial applications. Van der Waals (vdW) materials with low crystalline symmetry and topological band structures, e.g., Weyl semimetals (WSMs), potentially serve as an outstanding system that may simultaneously realize field-free switching and high energy efficiency. Yet, the demonstration of these superiorities at room temperature has not been realized. Here, we achieve a field-free switching of perpendicular magnetization by using a layered type II WSM, TaIrTe4, in a TaIrTe4/Ti/CoFeB system at room temperature with the critical switching current density ~2.4 × 106 A cm-2. The field-free switching is ascribed to the out-of-plane SOT allowed by the low crystal symmetry. Our work suggests that using low-symmetry materials to generate SOT is a promising route for the manipulation of perpendicular magnetization at room temperature.

Published
2023

235. Electrical Detection of Magnetic Skyrmions in a Magnetic Tunnel Junction (Adv. Electron. Mater. 1/2023)

Author

Guang, Yao, primary, Zhang, Like, additional, Zhang, Junwei, additional, Wang, Yadong, additional, Zhao, Yuelei, additional, Tomasello, Riccardo, additional, Zhang, Senfu, additional, He, Bin, additional, Li, Jiahui, additional, Liu, Yizhou, additional, Feng, Jiafeng, additional, Wei, Hongxiang, additional, Carpentieri, Mario, additional, Hou, Zhipeng, additional, Liu, Junming, additional, Peng, Yong, additional, Zeng, Zhongming, additional, Finocchio, Giovanni, additional, Zhang, Xixiang, additional, Coey, John Michael David, additional, Han, Xiufeng, additional, and Yu, Guoqiang, additional

Published
2023
Full Text
View/download PDF

237. Tensile and stressed-oxidation behavior of 2D SiC/BN/SiC composites at Intermediate Temperatures in Air

Author

Yingdong Song, Rong Pan, Xiguang Gao, Huajun Zhang, Hongyan Shao, Fang Wang, Yu Guoqiang, Han Xiao, and Xie Chuyang

Subjects
Materials science, Process Chemistry and Technology, Element composition, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Degree (temperature), Stress level, Stress (mechanics), Ultimate tensile strength, Materials Chemistry, Ceramics and Composites, Fracture (geology), Degradation (geology), Fiber, Composite material
Abstract

The stressed-oxidation behavior of 2D CVI SiC/BN/SiC composites was studied at intermediate temperatures (800 °C) in air. The ultimate tensile strength (UTS) was acquired to determine the constant stress. The results show that the UTS at intermediate temperature is 14.3 % lower than that at room temperature. The strain-time curves at all stress levels show a deceleration stage and a stable stage. The stressed-oxidation rupture life decreases from 5.4 hr to 0.9 hr when the stress increases from 60 % to 90 % of the UTS. The element composition and fracture morphologies of the composites were also analyzed. The results show that the oxidation degree increases as the rupture time increases or constant stress decreases. Fiber degradation and interface defects caused by component oxidation induced local fiber failure and ultimate rupture of the composites, which may be attributed to strength degradation at intermediate temperatures and rupture of the composites during stress oxidation.

Published
2022

238. Tailoring the magnetic exchange interaction in MnBi2Te4 superlattices via the intercalation of ferromagnetic layers

Author

Chen, Peng, primary, Yao, Qi, additional, Xu, Junqi, additional, Sun, Qiang, additional, Grutter, Alexander J., additional, Quarterman, Patrick, additional, Balakrishnan, Purnima P., additional, Kinane, Christy J., additional, Caruana, Andrew J., additional, Langridge, Sean, additional, Li, Ang, additional, Achinuq, Barat, additional, Heppell, Emily, additional, Ji, Yuchen, additional, Liu, Shanshan, additional, Cui, Baoshan, additional, Liu, Jiuming, additional, Huang, Puyang, additional, Liu, Zhongkai, additional, Yu, Guoqiang, additional, Xiu, Faxian, additional, Hesjedal, Thorsten, additional, Zou, Jin, additional, Han, Xiaodong, additional, Zhang, Haijun, additional, Yang, Yumeng, additional, and Kou, Xufeng, additional

Published
2022
Full Text
View/download PDF

242. Geometric parameters characterization of minicomposite and modulus prediction of 2D composite based on X-ray computed tomography

Author

Jia Yunfa, Yingdong Song, Dong Chengqian, Xiguang Gao, Fang Wang, and Yu Guoqiang

Subjects
Materials science, Process Chemistry and Technology, Composite number, Modulus, Geometry, Edge (geometry), Structure tensor, Finite element method, Edge detection, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Characterization (materials science), Materials Chemistry, Ceramics and Composites, Tomography
Abstract

The reconstruction quality of a three-dimensional (3D) model of woven composites and the mechanical performance of minicomposites have an important influence on the accuracy of finite element (FE) analysis. Through edge detection and morphological operations, the cross-sectional area of a SiC/SiC minicomposite and the volume content of each component were calculated. This method can also be used to obtain the pore distribution. For the SiC/SiC two-dimensional (2D) woven composite, the structure tensor was used to initially classify the weft and warp in the top view of the X-ray computed tomography (XCT) image, and then, the front view was derived to readily correct the misclassification regions. The edge equivalent is proposed because watershed segmentation cannot compute the edge at the overlapping regions. Then, multiple morphological operations were applied to achieve accurate individual warp recognition. Finally, comparing the modulus predicted by the reconstructed FE model with the experimental results, the prediction was found to be in good agreement with the experiment.

Published
2021

243. Tension–tension fatigue behavior and residual strength evolution of SiC/(PyC/SiC)2/SiC minicomposites prepared by CVI+MI and CVI+PIP processes

Author

Meng Weikang, Jia Yunfa, Yingdong Song, Xiguang Gao, Fang Wang, and Yu Guoqiang

Subjects
chemistry.chemical_classification, Materials science, Process Chemistry and Technology, Sintering, Polymer, Nanoindentation, Microstructure, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Residual strength, Stress (mechanics), chemistry, Ultimate tensile strength, Materials Chemistry, Ceramics and Composites, Fiber, Composite material
Abstract

The residual tensile strength (RTS) evolution of SiC/(PyC/SiC)2/SiC samples, prepared by chemical vapor impregnation (CVI) combined with either melting reaction sintering (MI) or polymer impregnation and pyrolysis (PIP), was investigated after 106 cycles as the pre-fatigue stress increased. The fatigue limits of the two tested specimen types, CVI + MI and CVI + PIP, were 760 and 660 MPa, respectively, corresponding to 95% and 75% of the tensile strength, respectively. Although the RTS of the two specimen types first increased and then decreased, it was interesting that after pre-fatigue, the maximum RTS of the CVI + PIP-prepared sample at 680 MPa, was 16 MPa higher than that of the CVI + MI-prepared sample at 590 MPa. The nanoindentation results indicate that the matrix prepared by CVI could protect the fiber from heavy damage in subsequent preparation, and the matrix modulus and hardness were higher in samples prepared by PIP than those prepared by MI. According to the microstructure observations and hysteresis characteristics, it was concluded that the differences mainly came from the internal stress state, matrix, and fiber properties.

Published
2021

244. Stressed-oxidation behavior of 2D CVI SiC/BN/SiC at elevated temperature in air

Author

Yu Guoqiang, Rong Pan, Fang Wang, Han Xiao, Jian Shi, Yingdong Song, Fangxiao Song, and Xiguang Gao

Subjects
Materials science, Process Chemistry and Technology, engineering.material, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Coating, Constant stress, Thermal, Ultimate tensile strength, Materials Chemistry, Ceramics and Composites, engineering, Degradation (geology), Fiber degradation, Sic fiber, Fiber, Composite material
Abstract

The stressed-oxidation behaviors of 2D woven SiCf/BN/SiC composites were investigated at 950 °C and 1100 °C in air. The different proportions (60%–90%) of the ultimate tensile strength (UTS) at corresponding temperatures were chosen as constant stress. The stressed-oxidation experiments were taken to failure or interrupted (240h). The UTS decreases by 20.75% at 950 °C and 30.71% at 1100 °C. The composites did not fail during stressed oxidation when subjected to constant stress corresponding to the initial linear and the beginning of nonlinear segments of the tensile curve, above which the composites failed with a maximum failure life of about 10h. Fiber degradation due to the thermal exposure and the fiber cracks caused by the oxidation of BN interface coating and SiC fiber could be responsible for the strength degradation and failure of the composites during stressed oxidation.

Published
2021

245. Influence of tensile pre-fatigue stress on residual strength of SiC/(PyC/SiC)2/SiC minicomposites

Author

Song Dong, Gao Xiguang, Song Yingdong, Jia Yunfa, Jian Shi, Yu Guoqiang, and Fang Wang

Subjects
010302 applied physics, Materials science, Process Chemistry and Technology, Uniaxial tension, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Stress (mechanics), Residual strength, stomatognathic system, Deflection (engineering), 0103 physical sciences, Ultimate tensile strength, Materials Chemistry, Ceramics and Composites, Fatigue stress, Fiber, Composite material, 0210 nano-technology, Stress concentration
Abstract

The tensile-tension fatigue behavior of minicomposite SiC/(PyC/SiC)2/SiC at room temperature was studied, and the residual mechanical properties of specimens were tested after 106 pre-fatigue cycles under different levels of stress. The results show that the residual strength first increases owing to the release of stress concentration and then decreases owing to excessive fiber wear. In addition, it is worth noting that the tensile curve of pre-fatigue specimens deflects twice; the first occurrence correlates with matrix crack reopening, and the second occurs when the uniaxial tensile load exceeds the pre-fatigue stress, and the degree of deflection also gradually decreases or almost disappears.

Published
2021

246. An equivalent diffusion coefficient model of the oxidation of ceramic matrix composites

Author

Ni Zheng, Yingdong Song, Du Jinkang, Xiguang Gao, Yuanhong Wang, Yu Guoqiang, Fang Wang, and Shi Xiaoting

Subjects
010302 applied physics, Materials science, Process Chemistry and Technology, Numerical analysis, Airflow, 02 engineering and technology, Mechanics, 021001 nanoscience & nanotechnology, Ceramic matrix composite, 01 natural sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Condensed Matter::Materials Science, Diffusion process, Scientific method, 0103 physical sciences, Materials Chemistry, Ceramics and Composites, Coupling (piping), Diffusion (business), 0210 nano-technology, Tensile testing
Abstract

A multiscale analysis method was developed to simulate the reaction-diffusion process of SiC/SiC composite structures in a coupled thermo-chemo-mechanical environment. For the diffusion process, the airflow channel was characterized by an equivalent diffusion coefficient model, which was established in this study. The corresponding calculation was developed using a numerical analysis method to obtain the gas concentration distribution in the structure. For the reaction process, an oxidation kinetics model was adopted to calculate morphological evolution of the airflow channel. The equivalent diffusion coefficient was then updated, and the reaction–diffusion coupling calculation was performed through an iterative scheme. To validate the model, an oxidation tensile test was conducted at 1200 °C. Finally, an adjustment sheet model was calculated as an example to analyze its reaction-diffusion process, proving that this method can be applied to SiC/SiC components under complex aerodynamic and temperature loads.

Published
2021

248. Perpendicular Magnetization Switching Driven by Spin‐Orbit Torque for Artificial Synapses in Epitaxial Pt‐Based Multilayers

Author

Zhang, Qiqi, primary, Zhao, Yunchi, additional, He, Congli, additional, Huo, Yuping, additional, Cui, Baoshan, additional, Zhu, Zengtai, additional, Zhang, Guangyu, additional, Yu, Guoqiang, additional, He, Bin, additional, Zhang, Yi, additional, Lyu, Haochang, additional, Guo, Yaqin, additional, Qi, Jie, additional, Shen, Shipeng, additional, Wei, Hongxiang, additional, Shen, Baogen, additional, and Wang, Shouguo, additional

Published
2022
Full Text
View/download PDF

250. Electrical Detection of Magnetic Skyrmions in a Magnetic Tunnel Junction

Author

Guang, Yao, primary, Zhang, Like, additional, Zhang, Junwei, additional, Wang, Yadong, additional, Zhao, Yuelei, additional, Tomasello, Riccardo, additional, Zhang, Senfu, additional, He, Bin, additional, Li, Jiahui, additional, Liu, Yizhou, additional, Feng, Jiafeng, additional, Wei, Hongxiang, additional, Carpentieri, Mario, additional, Hou, Zhipeng, additional, Liu, Junming, additional, Peng, Yong, additional, Zeng, Zhongming, additional, Finocchio, Giovanni, additional, Zhang, Xixiang, additional, Coey, John Michael David, additional, Han, Xiufeng, additional, and Yu, Guoqiang, additional

Published
2022
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results