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When thermoelectric materials come across with magnetism

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Rare Metals 2021年第4期40卷 752-766页

作者： Chen-Chen Zhao Chong Xiao Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Institute of Energy Hefei Comprehensive National Science CenterHefei 230031China

Nowadays,thermoelectric materials have attracted a lot of attention as they can directly convert heat into electricity and vice ***,while strenuous efforts have been made,those conventional strategies are still inevitably going to meet their performance optimization *** this reason,brand new strategies are badly needed to achieve further ***,the roles played by magnetism in recent advances of thermoelectric optimization are ***,magnetic thermoelectric materials can just be treated like other normal materials because the use of universal optimization strategies can still get good ***,it is not a situation which is all or nothing and the tactics of using magnetism for thermoelectric optimization can coexist with other ***,through magnetic doping,we can introduce and adjust magnetism in materials for further *** provides more possibilities in thermoelectric optimization as it can directly influence the spin states in ***,in the form of magnetic secondphase nanoclusters,magnetism can be introduced to thermoelectric materials to conquer the dilemma that the solid solubility of many magnetic ions in thermoelectric materials is too low to have any significant effect on thermoelectric ***,when exposed to an external magnetic field,topological materials can rely on its unique band structures to optimize.

关键词： Thermoelectricity magnetic thermoelectric materials Magnetism magnetic doping magnetic second phase

Enhanced spin–orbit torque efficiency in Pt100−xNix alloy based magnetic bilayer

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Chinese Physics B 2021年第3期30卷 100-104页

作者： Congli He Qingqiang Chen Shipeng Shen Jinwu Wei Hongjun Xu Yunchi Zhao Guoqiang Yu Shouguo Wang Institute of Advanced Materials Beijing Normal UniversityBeijing 100875China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

The binary alloy/ferromagnetic metal heterostructure has drawn extensive attention in the research field of spin–orbittorque(SOT)due to the potential enhancement of SOT efficiency via composition *** this work,the magneticproperties and SOT efficiency in the Pt100−xNix/Ni78Fe22 bilayers were investigated via the spin-torque ferromagneticresonance(ST-FMR)*** effective magnetic anisotropy field and effective damping constant extracted by analyzing the ST-FMR spectra show a weak dependence on the Ni *** effective spin-mixing conductanceof 8.40×10^(14)Ω−1·m−2and the interfacial spin transparency Tin of 0.59 were obtained for the sample of Pt70Ni30/*** interestingly,the SOT efficiency that is carefully extracted from the angular dependence of ST-FMR spectrashows a nonmonotonic dependence on the Ni concentration,which reaches the maximum at x=*** enhancement ofthe SOT efficiency by alloying the Ni with Pt shows potential in lowering the critical switching ***,alloyingrelatively cheaper Ni with Pt may promote to reduce the cost of SOT devices.

关键词： spin-orbit torque magnetic doping spin-torque ferromagnetic resonance

Growth of Fe-Doped and V-Doped MoS2 and Their magnetic-Electrical Effects

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Journal of Electronic Science and Technology 2022年第3期20卷 225-236页

作者： Rui Tao Zhi-Hao Yang Chao Tan Xin Hao Zun-Gui Ke Lei Yang Li-Ping Dai Xin-Wu Deng Ping-Jian Li Ze-Gao Wang the College of Materials Science and Engineering Sichuan UniversityChengdu610065China Southwest Institute of Technical Physics Chengdu610046China the State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu610054China

Magnetism in two-dimensional(2D)materials has attracted much attention ***,intrinsic magnetic 2D materials are rare and mostly unstable in *** heteroatom doping can introduce magnetism,the basic property especially the electrical-magnetic coupling property has been rarely ***,both iron(Fe)-doped and vanadium(V)-doped MoSfilms were grown by chemical vapor *** studying the structure and electrical property of Fe-doped and V-doped MoS,it was found that both Fe and V doping would decrease the electron concentration,exhibiting a p-type doping ***,V-doped MoSdisplays a p-type conduction *** the carrier mobility decreases after heteroatom doping,both Fe and V doping could endow MoSwith magnetism,in which the transfer curves of both MoStransistors exhibit a strong magneticdependent *** is found that the magnetic response of Fe-doped MoScan be tuned from~0.2 nA/T to~1.3 nA/T,with the tunability much larger than that of V-doped *** last,the magnetic mechanism is discussed with the local magnetic property performed by magnetic force *** typical morphology-independent magnetic signal demonstrates the formed magnetic domain structure in Fe-doped *** study opens new potential to design novel magnetic-electrical devices.

关键词： magnetic domain magnetic doping MoS2 p-type semiconductor

Light-matter interactions in high quality manganesedoped two-dimensional molybdenum diselenide

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Science China Materials 2021年第10期64卷 2507-2518页

作者： Sheng Liu Yaze Wu Xue Liu res Granados del Aguila Fengyuan Xuan Apoorva Chaturvedi Hua Zhang Su Ying Quek Qihua Xiong Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore Department of Physics National University of Singapore2 Science Drive 3Singapore 117551Singapore School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Department of Chemistry City University of Hong KongHong KongChina Hong Kong Branch of National Precious Metals Material Engineering Research Center(NPMM) City University of Hong KongHong KongChina Centre for Advanced 2D Materials National University of SingaporeSingapore 117546Singapore State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China

Introducing magnetic dopants into twodimensional transition metal dichalcogenides has recently attracted considerable attention due to its promising applications in spintronics and *** we realized manganese-doped molybdenum diselenide(MoSe_(2))single crystal via chemical vapor transport(CVT)reaction,containing up to 2.9%(atomic concentration)Mn dopants,and investigated the light-matter interaction in these *** observed a suppressed trion intensity,a longer photoluminescence lifetime,and prominent blue-and red-shift of E_(2g)^(2)(in-plane)and A_(1g)(out-of-plane)Raman modes,***,the Mn dopants increase the valley Zeeman splitting of the MoSe_(2) monolayer by~50%,while preserving the linear dependence on magnetic ***-principles calculations indicate that the spin-polarized deep level defect states are formed due to the Mn substitutional dopants in the Mo Se_(2) *** resulting defect potential favors the funnelling of excitons towards the *** Mn dopants reduce the magnitude of the interatomic force constants,explaining the red-shift of the A_(1g)*** Mn atoms and their immediate Mo and Se neighbors carry significant magnetic moments,which enhance the observed exciton g-factors due to the exchange interactions affecting defect-bound excitons.

关键词： first-principles calculations exciton funnelling twodimensional semiconductor magnetic doping valley-Zeeman effect

高品质锰掺杂二维二硒化钼晶体的光与物质相互作用（英文）

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Science China Materials 2021年

作者：刘盛武亚则刘学 AndresGranadosdelAguila 铉丰源 ApoorvaChaturvedi 张华郭淑瑛熊启华 DivisionofPhysicsandAppliedPhysics SchoolofPhysicalandMathematicalSciencesNanyangTechnologicalUniversity DepartmentofPhysics NationalUniversityofSingapore CentreforAdvanced2DMaterials NationalUniversityofSingapore SchoolofMaterialsScienceandEngineering NanyangTechnologicalUniversity DepartmentofChemistry CityUniversityofHongKong HongKongBranchofNationalPreciousMetalsMaterialEngineeringResearchCenter(NPMM) CityUniversityofHongKong StateKeyLaboratoryofLow-DimensionalQuantumPhysicsandDepartmentofPhysics TsinghuaUniversity

最近,将磁性掺杂引入到二维硫族化合物中从而调控自旋电子学及谷电子学的研究引起了科学界的广泛关注.本文通过化学气相转移生长技术,实现了二硒化钼高达2.9%原子丰度的锰掺杂,并采用光谱学技术研究了晶体及解理的少层样品中光与物质相... 详细信息

最近,将磁性掺杂引入到二维硫族化合物中从而调控自旋电子学及谷电子学的研究引起了科学界的广泛关注.本文通过化学气相转移生长技术,实现了二硒化钼高达2.9%原子丰度的锰掺杂,并采用光谱学技术研究了晶体及解理的少层样品中光与物质相互作用.我们发现掺杂抑制了带电激子的发光,激子发光具有更长的时间寿命,同时面内E2g2和面外A1g声子振动模式分别呈现出显著的蓝移和红移.此外,锰掺杂增强了能谷塞曼劈裂约50%,并保持了发光线偏振度对磁场的依赖关系.第一性原理计算显示,锰掺杂替代原子形成自旋极化的深能级,导致缺陷势场更倾向于捕获激子.锰掺杂降低了原子间的相互作用力常数,可以解释面外A1g声子振动模式的红移.锰原子及最近邻的钼和硒原子带有显著的磁偶极,其交换作用影响了缺陷捕获的激子,从而增强了实验中观察到的g-因子.

关键词： first-principles calculations exciton funnelling two-dimensional semiconductor magnetic doping valley-Zeeman effect