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Room temperature ferromagnetism in ultra-thin van der Waals crystals of 1T-CrTe2

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Nano Research 2020年第12期13卷 3358-3363页

作者： xingdan sun Wanying Li Xiao Wang Qi Sui Tongyao Zhang Zhi Wang Long Liu Da Li Shun Feng Siyu Zhong Hanwen Wang Vincent Bouchiat Manuel Nunez Regueiro Nicolas Rougemaille Johann Coraux Anike Purbawati Abdellali Hadj-Azzem Zhenhua Wang Baojuan Dong Xing Wu Teng Yang Guoqiang Yu Bingwu Wang Zheng Han Xiufeng Han Zhidong Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Material Science and Engineering University of Science and Technology of ChinaHefei230026China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China Songshan Lake Materials Laboratory Dongguan523808China Beijing National Laboratory for Molecular Sciences Beijing Key Laboratory of Magnetoelectric Materials and DevicesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing100871China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan030006China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan030006China Shanghai Key Laboratory of Multidimensional Information Processing Department of Electrical Engineering East China Normal University500 Dongchuan RoadShanghai200241China Institut Néel University Grenoble AlpesCNRSGrenoble INPF-38000GrenobleFrance School of Physical Science and Technology ShanghaiTech UniversityShanghai200031China

Although many emerging new phenomena have been unraveled in two dimensional(2D)materials with long-range spin orderings,the usually low critical temperature in van der Waals(vdW)magnetic material has thus far hindered the related practical ***,we show that ferromagnetism can hold above 300 K in a metallic phase of 1T-CrTe2 down to the ultra-thin *** thus makes CrTe2 so far the only known exfoliated ultra-thin vdW magnets with intrinsic long-range magnetic ordering above room *** in-plane room-temperature negative anisotropic magnetoresistance(AMR)was obtained in ultra-thin CrTe2 devices,with a sign change in the AMR at lower temperature,with−0.6%and+5%at 300 and 10 K,*** findings provide insights into magnetism in ultra-thin CrTe2,expanding the vdW crystals toolbox for future room-temperature spintronic applications.

关键词： room temperature ferromagnetism two dimensional(2D) CrTe2 anisotropic magnetoresistance(AMR)

Perspectives on exfoliated two-dimensional spintronics

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Journal of Semiconductors 2019年第8期40卷 81-91页

作者： Xiaoxi Li Baojuan Dong xingdan sun Hanwen Wang Teng Yang Guoqiang Yu Zheng Vitto Han Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China School of Material Science and Engineering University of Science and Technology of China Hefei 230026 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China

Magnetic orderings, i.e., the spontaneous alignment of electron spins below a critical temperature, have been playing key roles in modern science and technologies for both the wide applications of magnetic recording for information storage and the vibrant potential of solid state electronic spin devices (also known as spintronics) for logic operations. In the past decades, thanks to the development of thin film technologies, magnetic thin films via sputtering or epitaxial growth have made the spintronic devices possible at the industrial scale. Yet thinner materials at lower costs with more versatile functionalities are highly desirable for advancing future spintronics. Recently, van der Waals magnetic materials, a family of magnets that can in principle be exfoliated down to the monolayer limit, seem to have brought tremendous opportunities: new generation van der Waals spintronic devices can be seamlessly assembled with possible applications such as optoelectronics, flexible electronics, and etc. Moreover, those exfoliated spintronic devices can potentially be compatible with the famed metal-oxide field effect transistor architectures, allowing the harness of spin performances through the knob of an electrostatic field.

关键词： van der Waals magnetic materials spintronics two dimensional materials

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情景模拟结合案例法在护生新发呼吸道传染病职业防护技能教学中的应用

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河南医学研究 2023年第22期32卷 4169-4172页

作者：周思佳叶琳李星丹吉慧聪孙丹郑州大学第一附属医院心血管内科河南郑州450000 郑州大学第一附属医院鼻科河南郑州450000 郑州大学第一附属医院小儿内科河南郑州450000 郑州大学第一附属医院感染性疾病科河南郑州450000 郑州大学第一附属医院呼吸内科河南郑州450000

目的探讨情景模拟结合案例教学法在护生新发呼吸道传染病防护技能临床实践教学中的应用效果。方法选取2022年8—9月在某三甲医院实习的护生70名,分为对照组和干预组,各35名。对照组接受传统的培训方法,干预组接受情景模拟结合案例教... 详细信息

目的探讨情景模拟结合案例教学法在护生新发呼吸道传染病防护技能临床实践教学中的应用效果。方法选取2022年8—9月在某三甲医院实习的护生70名,分为对照组和干预组,各35名。对照组接受传统的培训方法,干预组接受情景模拟结合案例教学法。比较两组学生自主学习能力测评量表评分、一般自我效能感量表评分、理论知识成绩及技能考核成绩,评价培训效果。结果培训后干预组护生自我效能感量表得分高于对照组,自主学习能力量表中学习动机得分、学习合作能力得分、信息素质得分及总分高于对照组(P<0.05)。培训后干预组护生理论成绩及及技能成绩得分高于对照组(P<0.05)。结论情景模拟结合案例教学法可提高护生自主学习能力和自我效能,提高新发呼吸道传染病防护技能。

关键词：护生案例教学法情景模拟新发呼吸道传染病职业防护技能

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小型壁稳氩弧紫外-真空紫外光源的研究

光学学报 1984年第11期 1011-1017页

作者：李福田孙国华刘元群陈星旦中国科学院长春光学精密机械研究所中国科学院长春光学精密机械研究所

已研制成配有四级差分泵单元的2.5kW小型壁稳氩弧光源.其光谱辐射稳定性和重复性优于±0.5%,一致性优于±1%.其连续光谱分布可用Hofsaess理论计算,准确度达10%.等离子体光谱学诊断表明:氩弧电流40A、气压1.75×105Pa时,等离子体温度为12... 详细信息

已研制成配有四级差分泵单元的2.5kW小型壁稳氩弧光源.其光谱辐射稳定性和重复性优于±0.5%,一致性优于±1%.其连续光谱分布可用Hofsaess理论计算,准确度达10%.等离子体光谱学诊断表明:氩弧电流40A、气压1.75×105Pa时,等离子体温度为12,650K,电子密度为1.29×1017cm-3.

关键词：紫外光源等离子体光谱光谱辐射等离子体温度原子谱线泵单元自由-自由跃迁电子密度光谱分布对数曲线