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6th IEEE Information Technology and Mechatronics engineering Conference, ITOEC 2022

作者： Li, Jiacheng Li, Haowei Li, Jianhua Beijing Institute of Technology Beijing China Beijing Engineering Research Center of Detection and Application for Weak Magnetic Field Department of Physics University of Science and Technology Beijing Beijing100083 China

ISBN: (纸本)9781665431859

magnetic anomaly detection is a widely used detection method. Because magnetic detection is not affected by soil, water and other media, it is widely used in prospecting, positioning and other fields. magnetic gradient tensor, as a new detection method, can realize the inversion of the target position by measuring the change rates of the three components of the magnetic field in three directions. It has good mathematical characteristics and is a research hotspot in the field of magnetic detection. In this paper, the magnetic gradient tensor based target location technology is studied for weak magnetic target location, and a target location algorithm based on magnetic gradient tensor information is proposed. A corresponding location system is built with AMR magnetic sensor, which can achieve accurate location of magnetic anomaly targets within 0.25m. © 2022 IEEE.

关键词： Location

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Asymmetric scattering behaviors of spin wave dependent on magnetic vortex chirality

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Chinese Physics B 2023年第10期32卷 635-640页

作者：张雪枫沈帝虎马晓萍宋成于海明朴红光 Hubei Engineering Research Center of Weak Magnetic-Field Detection China Three Gorges UniversityYichang 443002China Department of Physics College of ScienceYanbian UniversityYanji 133002China Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Fert Beijing Institute School of Integrated Circuit Science and EngineeringBeijing Advanced Innovation Center for Big Data and Brain ComputingBeihang UniversityBeijing 100191China

We investigate asymmetric spin wave scattering behaviors caused by vortex chirality in a cross-shaped ferromagnetic system by using the micromagnetic *** the system,four scattering behaviors are found:(i)asymmetric skew scattering,depending on the polarity of vortex core,(ii)back scattering(reflection),depending on the vortex core stiffness,(iii)side deflection scattering,depending on structural symmetry of the vortex circulation,and(iv)geometrical scattering,depending on waveguide *** first and second scattering behaviors are attributed to nonlinear topological magnon spin Hall effect related to magnon spin-transfer torque effect,which has value for magnonic exploration and application.

关键词： magnonics magnetic vortex spin wave magnetic chirality

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CrAlGe:An itinerant ferromagnet with strong tunability by heat treatment

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Chinese Physics B 2022年第11期31卷 555-559页

作者： Zhaokun Dong Zhen Wang Te Zhang Junsen Xiang Shuai Zhang Lihua Liu Peijie Sun Department of Physics Beijing Engineering Research Center of Detection and Application for Weak Magnetic fieldUniversity of Science and Technology BeijingBeijing 100083China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China

We present a comprehensive investigation on CrAlGe and realize that it is an itinerant ferromagnet with strong tunability of the Curie temperature T_(C)and the spontaneous momentμ_(0)depending on annealing heat *** the value of T_(C) was previously reported to be 80 K withμ_(0)≈0.41μB,in this work the two quantities attain values as high as 170 K and 0.66μ_(B),*** treatment does not cause changes of the lattice parameters and symmetry,but results in a slight narrowing of the Bragg *** strong tunability of the itinerant ferromagnetism indicates significantly tunable hybridization between the Cr 3d electrons and the conduction bands,in agreement with the dominant Cr–Al/Ge bonds of this *** tuning along the same line towards even stronger or weaker itinerant ferromagnetism promises an interesting follow-up to clarify the localized-itinerant duality of the 3d electrons in this compound.

关键词： itinerant ferromagnet localized-itinerant duality heat treatment hybridization

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Distributed strain sensing cable based on ultra-weak fiber grating

Distributed strain sensing cable based on ultra-weak fiber g...

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2023 Applied Optics and Photonics China: Optic Fiber Gyro, AOPC 2023

作者： Huang, Jianglou He, Yunrui Wang, Xiaolong Ran, Changyan He, Huiling Luo, Zhihui Hubei Engineering Research Center of Weak Magnetic-field Detection China Three Gorges University Hubei Yichang443002 China College of Science Chain Three Gorges University Hubei Yichang443002 China

ISBN: (纸本)9781510672420

Aiming at improving the performance of distributed sensing fiber, a distributed strain sensing optical cable based on ultra-weak fiber gratings is proposed. The optical cable is prepared by pretreating an ultra-weak fiber grating array with a pitch of 0.2 m, compounding it with glass fiber to make an FRP sensing fiber with a diameter of 1.0 mm, and then twisting with a steel cable and extruding the sheath. The multilayer structure strain transfer model of steel cable-FRP-optical fiber is established, and the temperature characteristics of the optical cable were tested by the water bath method, the tensile test of the optical cable was carried out by the tensile machine. The results show that the temperature sensitivity of the optical cable is 23.8 pm/°C, the strain sensitivity is 1.72 pm/N, there is no "strain dead zone"during strain tension, and the strain transfer effect is good, which provides a potential solution for high-resolution distributed strain sensing. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Tensile testing

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Nanocavity-Mediated Fast magnetic Vortex Core In-Situ Switching by Local magnetic field

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Chinese Physics Letters 2021年第12期38卷 76-79页

作者： Xiao-Ping Ma Hongguo Yang Changfeng Li Cheng Song Hong-Guang Piao Hubei Engineering Research Center of Weak Magnetic-Field Detection College of ScienceChina Three Gorges UniversityYichang 443002China Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Fast in situ switching of magnetic vortex core in a ferromagnetic nanodisk assisted by a nanocavity,with diameter comparable to the dimension of a vortex core,is systematically investigated by changing the strength as well as the diameter of the effective circular region of the applied magnetic *** applying a local magnetic field within a small area at the nanodisk center,fast switching time of about 35 ps is achieved with relatively low field strength(70 mT)which is beneficial for fast data reading and *** reason for this phenomenon is that the magnetic spins around the nanocavity is aligned along the cavity wall due to the shape anisotropy when the perpendicular field is applied,which deepens the dip around the vortex core,and thus facilitates the vortex core switching.

关键词： strength cavity vortex

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High-resolution noncontact electrostatic voltage meter based on microsensor chip∗∗Resrach supported by the Key Projects of National Natural Science Foundation of China (62031025), the National Key research and Development Plan of China (2018YFF01010800), and the Fundamental research Funds for the Central Universities (FRF-TP-19-045A2, FRF-BD-19-017A, and FRF-BD-20-12A) 16

High-resolution noncontact electrostatic voltage meter based...

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16th Annual IEEE International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2021

作者： Wen, Xiaolong Yang, Pengfei Zhang, Bo Peng, Chunrong University of Science and Technology Beijing Beijing Engineering Research Center of Detection and Application for Weak Magnetic Field Department of Physics Beijing100083 China School of Applied Science Beijing Information Science and Technology University Beijing100192 China University of Science and Technology Beijing Beijing Engineering Research Center of Detection and Application for Weak Magnetic Field Department of Physics Beijing100083 China Aerospace Information Research Institute Chinese Academy of Sciences State Key Laboratory of Transducer Technology Beijing100190 China

ISBN: (纸本)9781665419413

Electrostatic voltage is a vital parameter in industrial production lines for reducing electrostatic discharge harms and improving yields. Due to such drawbacks as package shielding and low resolution, previously reported electric field microsensors are still not applicable in industrial lines. In this paper, we introduce a new designed microsensor package structure which enhances the field strength inside the package cavity remarkably. This magnification effect is studied and optimized by both theoretical calculation and ANSYS simulation. By means of digital synthesizer and digital coherent demodulation method, the compact signal processing circuit for the packaged microsensor is developed. The meter protype is calibrated above a charged metal plate, and the measuring error is less than 1V from -1kV to 1kV in 2.5 centimeters distance. The meter is also installed into a production line and shows good consistency with and better resolution than a traditional vibratory capacitance sensor. © 2021 IEEE.

关键词： Capacitance

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Giant Room-Temperature Spontaneous Exchange Bias in Antiferromagnet Fe3BO6

SSRN

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SSRN 2024年

作者： Wang, Lifeng Cai, Ling He, Xiong Yang, Fanli Chen, Jie Yi, Lizhi Liu, Min Xu, Yunli Xia, Zhengcai Pan, Liqing Hubei Engineering Research Center of Weak Magnetic-field Detection College of Science China Three Gorges University Yichang443002 China Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan430074 China

It is of great importance to search for materials with giant spontaneous exchange bias effect (SEB) at room temperature, as it has wide application prospects in information storage technology, etc. In this work, we observe a giant SEB in antiferromagnetic Fe3BO6 polycrystals, the value of the spontaneous exchange bias field at room temperature is as large as about 4234 Oe. The room-temperature training effect as well as the temperature and the maximum measured field dependence of the HSEB are investigated, respectively. We propose that this giant SEB originates from the exchange-coupling interactions between the surface weak ferromagnet state and the bulk antiferromagnet state. The results of this investigation will help to find promising candidate materials for a device based on the SEB effect. © 2024, The Authors. All rights reserved.

关键词： Room temperature

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Two-Dimensional Topological Ferroelectric Metal with Giant Shift Current

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Physical Review Letters 2024年第18期133卷 186801页

作者： Liu Yang Lei Li Zhi-Ming Yu Menghao Wu Yugui Yao Department of Physics Hubei Engineering Research Center of Weak Magnetic-field Detection Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems School of Physics International Center for Quantum Materials School of Physics

The pursuit for “ferroelectric metal,” which combines seemingly incompatible spontaneous electric polarization and metallicity, has been assiduously ongoing but remains elusive. Unlike traditional ferroelectrics with a wide band gap, ferroelectric (FE) metals can naturally incorporate nontrivial band topology near the Fermi level, endowing them with additional exotic properties. Here, we show first-principles evidence that the metallic PtBi2 monolayer is an intrinsic two-dimensional (2D) topological FE metal, characterized by out-of-plane polarization and a moderate switching barrier. Moreover, it exhibits a topologically nontrivial electronic structure with Z2 invariant equal to 1, leading to a significant FE bulk photovoltaic effect. A slight strain can further enhance this effect to a remarkable level, which far surpasses that of previously reported 2D and 3D FE materials. Our Letter provides an important step toward realizing intrinsic monolayer topological FE metals and paves a promising way for future nonlinear optical devices.

关键词： Ferroelectricity Shift current Topological materials Van der Waals systems Density functional theory First-principles calculations

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Nutation Mode Suppression of magnetic Bearing Rotor System under Operating Point Deviation

Nutation Mode Suppression of Magnetic Bearing Rotor System u...

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2022 Chinese Automation Congress, CAC 2022

作者： Liu, Ximing Bo, Le Zhou, Jinxiang Beihang University School of Instrumentation and Optoelectronic Engineering Beijing China Beihang University Ningbo Institute of Technology Ningbo China Beihang University Key Laboratory of Ultra-Weak Magnetic Field Measurement Technology Ministry of Education School of Instrumentation and Optoelectronic Engineering Beijing China Beihang University Beijing Engineering Research Center of High-Speed Magnetically Suspended Motor Technology and Application Beijing China

ISBN: (纸本)9781665465335

The stable control of the magnetic levitation large inertia rotor system is the core of the development of the magnetically suspended control torque gyroscope (MSCMG). This paper introduces the influence of the active magnetic bearings (AMBs) rotor system operating point deviation on the nutation modal suppression of the system when the MSCMG outputs torque. Aiming at this problem, this paper proposes a cross-feedback control method of rotor nutation mode under the constraint of support stiffness perturbation. The influence of support stiffness on the AMBs-rotor system is studied by drawing a Bode diagram, and the design of the cross-feedback control is optimized to ensure the stability of AMBs-rotor system under the condition of operating point deviation. © 2022 IEEE.

关键词： magnetic bearings

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Multiple sliding ferroelectricity of rhombohedral-stacked InSe for reconfigurable photovoltaics and imaging applications

arXiv

引用

arXiv 2024年

作者： Liang, Qingrong Zheng, Guozhong Yang, Liu Zheng, Shoujun School of Physics Beijing Institute of Technology Beijing100081 China School of Physics and Information Technology Shaanxi Normal University Xi'An710062 China Department of Physics Hubei Engineering Research Center of Weak Magnetic-field Detection China Three Gorges University Yichang443002 China

Through stacking engineering of two-dimensional (2D) materials, a switchable interface polarization can be generated through interlayer sliding, so called sliding ferroelectricity, which is advantageous over the traditional ferroelectricity due to ultra-thin thickness, high switching speed and low fatigue. However, 2D materials with intrinsic sliding ferroelectricity are still rare, with the exception of rhombohedral-stacked MoS2, which limits sliding ferroelectricity for practical applications such as high-speed storage, photovoltaic, and neuromorphic computing. Here, we reported the observation of sliding ferroelectricity with multiple states in undoped rhombohedral-stacked InSe (γ-InSe) via dual-frequency resonance tracking piezoresponse force microscopy, scanning Kelvin probe microscopy and conductive atomic force microscopy. The tunable bulk photovoltaic effect via the electric field is achieved in the graphene/γ-InSe/graphene tunneling device with a photovoltaic current density of ~15 mA/cm2, which is attributed to the multiple sliding steps in γ-InSe according to our theoretical calculations. The vdw tunneling device also features a high photo responsivity of ~255 A/W and a fast response time for real-time imaging. Our work not only enriches rhombohedral-stacked 2D materials for sliding ferroelectricity, but also sheds light on their potential for tunable photovoltaics and imaging applications. Copyright © 2024, The Authors. All rights reserved.

关键词： Van der Waals forces

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