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Ultrafast Magnetization Precession in Perpendicularly Magnetized L10-MnAl Thin Films with Co2 MnSi Buffer Layers

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Chinese Physics Letters 2020年第5期37卷 110-114页

作者： Si-Wei Mao Jun Lu long Yang Xue-Zhong Ruan hai-long wang Da-hai Wei Yong-Bing Xu Jian-Hua Zhao State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083 Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100190 Beijing Academy of Quantum Information Science Beijing 100193 Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials Collaborative Innovation Center of Advanced MicrostructuresSchool of Electronic Science and EngineeringNanjing UniversityNanjing 210093

Perpendicularly magnetized L10-MnAl thin films with Co2 MnSi bufer layers were prepared on GaAs(001)substrates by molecular-beam epitaxy(MBE).The samples with high crystalline quality show a maximum uniaxial perpendicular magnetic anisotropy constant of 1.4×10^7 erg/cm^*** spin dynamics with a magnetization precession frequency up to 200 GHz was investigated by using time-resolved magneto-optical Kerr effect(TRMOKE)measurements,from which the Gilbert damping constantαof epitaxial L10-MnAl thin films is evaluated to be less than *** work provides an important reference for analyzing the current-induced magnetization switching process in MnAl-based spintronic devices.

关键词： magnetization Gilbert anisotropy

Processing and properties of PcBN composites fabricated by HPHT using PSN and Al as sintering additive

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Rare Metals 2020年第5期39卷 570-576页

作者： Ming-Liang Li Li-Xing Liang hai-long wang Peng-Bo Zhao Xiao-Tong Zhao Gang Shao Rui Zhang School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Henan Key Laboratory of Aeronautical Material and Application Technology Zhengzhou University of AeronauticsZhengzhou 450052China

Dense polycrystalline cubic boron nitride(PcBN)composites were fabricated by high-pressure and high-temperature(HPHT)sintering using polysilazane(PSN)and Al as sintering *** high-energy ball milling,the cBN fine particles were uniformly coated with PSN by ultrasonic *** thermocuring and pyrolysis,the cBN–SiCN particles were mixed with Al The PcBN composites were prepared after sintering a1450°C for 10 min with a pressure of 5 *** refining effect of high-energy ball milling on the c BN particles was studied by scanning electron microscopy(SEM)and laser particle size *** oxidation of the cBN particles after milling was investigated by nitrogen–oxygen *** phase composition and microstructure of the sintered PcBN composites were investigated by X-ray diffractometer(XRD)and *** main phases of the sintered PcBN composites are c BN,AlN,SiC and Si3N4The conversion of cBN to hBN was inhibited by the formation of *** mechanical properties of the sintered PcBN composites were improved by the appearance of SiC and *** density and mechanical properties of the PcBN composites both increased with the content of the cBN particles *** sintered sample with 60 wt%cBN,30 wt%PSN and 10 wt%Al showed the best results density of 99.7%,Vickers’hardness of(25.2±0.8)GPa and flexural strength of(602±15)MPa.

关键词： Polycrystalline cubic boron nitride Highpressure and high-temperature sintering High-energy ball milling Mechanical properties

Graphene-coated conductive probes with enhanced sensitivity for nanoIR spectroscopy

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Nano Research 2023年第8期16卷 11326-11333页

作者： Yu-Jiao Xia-Hou Xu-Cheng Li En-Ming You Hong-Peng He Jun Yi Jun-Rong Zheng hai-long wang hai-Xin Lin Zhong-Qun Tian State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringSchool of Electronic Science and EngineeringCollaborative Innovation Center of Chemistry for Energy Materials(iChEM)Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM)Xiamen UniversityXiamen 361005China

Nano-infrared(nanoIR)probes play a crucial role as nano-mechanical sensors and antennas for light absorption and emission,and their testing performance is critically dependent on their optical properties and structural ***-coated dielectric probes are highly attractive for enhancing light–matter interactions and integrating IR photonics,providing a broadband optical response and strong electromagnetic ***,achieving continuous single-layer graphene growth on non-planar and non-single crystalline dielectrics is a significant challenge due to the low surface energy of the dielectric and the large difference in size between the probe tip,cantilever,and ***,we present a novel method for the growth of high-quality and continuous graphene with good conductivity on non-planar and amorphous dielectric probe surfaces using manganese oxide powder-assisted short time heating chemical vapor *** resulting graphene-coated dielectric probes exhibit an average IR reflectance of only 5%in the mid-IR band,significantly outperforming probes without continuous graphene *** probes can not only effectively transduce the local photothermal sample expansion caused by the absorption of IR laser pulses,but also effectively scatter near-field light,which is 25 times stronger than the commercial metal-coated probes,and have advantages in the application of nanoIR sensing based on atomic force microscope-based infrared(AFM-IR)spectroscopy and infrared scattering scanning near field optical microscopy(IR s-SNOM)***,our graphene growth method provides a solution for growing high-quality graphene on the surfaces of non-planar dielectric materials required for integrated circuits and other fields.

关键词： graphene-coated nano-infrared(nanoIR)spectroscopy atomic force microscope-based infrared(AFM-IR) infrared

Unusual Anomalous Hall Effect in a Co2MnSi/MnGa/Pt Trilayer

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Chinese Physics Letters 2020年第7期37卷 96-99页

作者： Shan Li Jun Lu Lian-Jun Wen Dong Pan hai-long wang Da-hai Wei Jian-Hua Zhao State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering&CAS Center of Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Beijing Academy of Quantum Information Science Beijing 100193China

An ultra-thin Co2MnSi(0.5 nm)/Mn Ga(1.5 nm) bilayer capped with Pt(5 nm) has been successfully grown by molecular-beam *** is a potential candidate of synthetic antiferromagnets due to antiferromagnetic coupling between Co2MnSi and MnGa,which is a promising skyrmion-racetrack-memory medium without skyrmion Hall effect after capping with a Pt *** humps in transverse Hall resistance loops are clearly observed in the temperature range from 260 to 400 *** anomaly is generally attributed to topological Hall effect,but other than that,we prove that non-uniform rotation of magnetic moments in the bilayer with magnetic field sweeping is also a possible mechanism contributed to the unusual hump.

关键词： layer. usual MnGa

Inhibiting MMP13 Attenuates Deep Vein Thrombosis in a Mouse Model by Reducing the Expression of Pdpn

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Current Medical Science 2024年第2期44卷 369-379页

作者： Ji LUO Jin ZHOU Jing-zeng LUO hai-long wang Xue-ling ZHAO Ru-dan ZHOU Department of Intensive Care Unit The First People's Hospital of ZiyangZiyang 641300China Department of Orthopedics Kunming Medical University Second Affiliated HospitalKunming 650033China Department of Orthopedics Kunming Medical University First Affiliated HospitalKunming 650032China Department of Orthopedics The Third People's Hospital of Yunnan ProvinceKunming 650200China

Objective:Matrix metalloproteinase 13(MMP13)is an extracellular matrix protease that affects the progression of atherosclerotic plaques and arterial thrombi by degrading collagens,modifying protein structures and regulating inflammatory responses,but its role in deep vein thrombosis(DVT)has not been *** purpose of this study was to investigate the potential effects of MMP13 and MMP13-related genes on the formation of ***:We altered the expression level of MMP13 in vivo and conducted a transcriptome study to examine the expression and relationship between MMP13 and MMP13-related genes in a mouse model of *** screening genes possibly related to MMP13 in DVT mice,the expression levels of candidate genes in human umbilical vein endothelial cells(HUVECs)and the venous wall were *** effect of MMP13 on platelet aggregation in HUVECs was investigated in ***:Among the differentially expressed genes,interleukin 1 beta,podoplanin(Pdpn),and factor VIII von Willebrand factor(F8VWF)were selected for analysis in *** MMP13 was inhibited,the expression level of PDPN decreased significantly in *** HUVECs,overexpression of MMP13 led to an increase in the expression level of PDPN and induced platelet aggregation,while transfection of PDPN-siRNA weakened the ability of MMP13 to increase platelet ***:Inhibiting the expression of MMP13 could reduce the burden of DVT in *** mechanism involves downregulating the expression of Pdpn through MMP13,which could provide a novel gene target for DVT diagnosis and treatment.

关键词： deep vein thrombosis matrix metalloproteinase 13 podoplanin

Tunable Perpendicular Magnetic Anisotropy in Off-Stoichiometric Full-Heusler Alloy Co_2MnAl

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Chinese Physics Letters 2019年第6期36卷 79-82页

作者： Zhi-Feng Yu Jun Lu hai-long wang Xu-Peng Zhao Da-hai Wei Jia-Lin Ma Si-Wei Mao Jian-Hua Zhao State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing Academy of Quantum Information Sciences

Off-stoichiometric full-Heusler alloy Co_2 MnAl thin films with different thicknesses are epitaxially grown on GaAs(001) substrates by molecular-beam epitaxy. The composition of the films, close to Co_(1.65)Mn_(1.35)Al(CMA),is determined by x-ray photoelectron spectroscopy and energy dispersive spectroscopy. Tunable perpendicular magnetic anisotropy(PMA) from 3.41 Merg/cm^3 to 1.88 Merg/cm^3 with the thickness increasing from 10 nm to 30 nm is found,attributed to the relaxation of residual compressive strain. Moreover, comparing with the ultrathin CoFeB/MgO used in the conventional perpendicular magnetic tunnel junction, the CMA electrode has a higher magnetic thermal stability with more volume involved. The PMA in CMA films is sustainable up to 300℃,compatible with semiconductor techniques. This work provides a possibility for the development of perpendicular magnetized full-Heusler compounds with high thermal stability and spin polarization.

关键词： Tunable Perpendicular Magnetic Anisotropy Full-Heusler Alloy Co2MnAl different thicknesses

Suppression of indium-composition fluctuations in InGaN epitaxial layers by periodically-pulsed mixture of N2 and H2 carrier gas

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Chinese Physics B 2018年第12期27卷 504-509页

作者： hai-long wang Xiao-Han Zhang Hong-Xia wang Bin Li Chong Chen Yong-Xian Li Zhi-Sheng Wu Hao Jiang State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen UniversityGuangzhou 510275China

Indium-composition fluctuations in InGaN epitaxial layers are suppressed by using periodically-pulsed mixture(PPM)of N2and H2carrier gas. Photoluminescence, optical transmission, reciprocal space map and space-resolved cathodoluminescence are employed to characterize the InGaN epilayers. It is shown that the lateral In-fluctuations mainly occur as hillock-like In-rich regions. Both the number and size of In-rich regions are reduced by introducing the PPM carrier ***, the measurements first experimentally demonstrate that the H2carrier gas has a stronger decomposition effect on the In-rich region. As the duration time of the PPM carrier gas increases, the reduction of In-content in the In-rich region reaches up to 12%, however, only 2% for the In-homogeneous region. These factors lead to the suppression of In-fluctuations.

关键词： InGaN alloys suppression of In-fluctuations periodically-pulsed mixture of nitrogen and hydrogen

Epitaxial Growth and Magnetic Properties of NiMnAs Films on GaAs Substrates

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Chinese Physics Letters 2019年第1期36卷 65-69页

作者： Jia-Lin Ma hai-long wang Xing-Min Zhang Shuai Yan Wen-Sheng Yan Jian-Hua Zhao State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Shanghai Synchrotron Radiation Facility Institute of Applied Physics Chinese Academy of Sciences National Synchrotron Radiation Laboratory University of Science and Technology of China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences

Single-phase Ni_(0.92)Mn_(1.08) As films with strained C_(1b) symmetry are grown on GaAs(001) substrates. In addition,a preferred epitaxial configuration of(110)-orientated Ni_(0.92)Mn_(1.08) As on(001)-orientated GaAs is revealed by synchrotron radiation measurement. The magnetic properties of the films are found to be significantly influenced by the growth temperature and the optimized growth temperature is determined to be ~370℃. According to the results of x-ray absorption spectroscopy, these phenomena can be attributed to the variation of the local electronic structure of the Mn atoms. Our work provides useful information for the further investigations of NiMnAs, which is a theoretically predicted half-metal.

关键词： Epitaxial Growth Magnetic Properties GaAs Substrates

Sorption of ammonium and phosphate from aqueous solution by biochar derived from phytoremediation plants

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2013年第12期14卷 1152-1161页

作者： Zheng ZENG Song-da ZHANG Ting-qiang LI Feng-liang ZHAO Zhen-li HE He-ping ZHAO Xiao-e YANG hai-long wang Jing ZHAO Muhammad Tariq RAFIQ Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health College of Environmental and Resource Sciences Zhejiang University Ningbo Raw Water Group Co. Ltd. Indian River Research and Education Center Institute of Food and Agricultural Sciences University of Florida School of Environmental and Resource Sciences Zhejiang A&F University

The study on biochar derived from plant biomass for environmental applications is attracting more and more attention. Twelve sets of biochar were obtained by treating four phytoremediation plants, Salix rosthornii Seemen, Thalia dealbata, Vetiveria zizanioides, and Phragmites sp., sequentially through pyrolysis at 500 °C in a N2 environment, and under different temperatures(500, 600, and 700 °C) in a CO2 environment. The cation exchange capacity and specific surface area of biochar varied with both plant species and pyrolysis temperature. The magnesium(Mg) content of biochar derived from T. dealbata(TC) was obviously higher than that of the other plant biochars. This biochar also had the highest sorption capacity for phosphate and ammonium. In terms of biomass yields, adsorption capacity, and energy cost, T. dealbata biochar produced at 600 °C(TC600) is the most promising sorbent for removing contaminants(N and P) from aqueous solution. Therefore, T. dealbata appears to be the best candidate for phytoremediation application as its biomass can make a good biochar for environmental cleaning.

关键词： Biochar Nutrient removal Plant species Pyrolysis temperature Water quality