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Journal of Materials Science & Technology 2002年第6期18卷 497-501页

作者： xiufeng hanstate key laboratory of magnetism, institute of {2. and {3. of Condensed Matter {2., chinese academy of sciences, beijing 100080, china chinese Acad Sci Inst Phys State Key Lab Magnetism Beijing 100080 Peoples R China chinese Acad Sci Ctr Condensed Matter Phys Beijing 100080 Peoples R China

An explicit function expression for the bias voltage or/and temperature dependences of tunnel magnetoresistance ratio and resistances were obtained with a unique set of intrinsic parameters. Two of these intrinsic parameters are the Curie temperature TC and the density of state (DOS) for itinerant majority and minority electrons ξ(ρM/ρm), which are the eigen parameters of ferromagnetic electrodes. Others are the spin-dependent matrix-element ratio (i.e., |Td|2.|TJ|2.) and the anisotropic-wavelength-cutoff energy ECγ of spin-wave spectrum in magnetic tunnel junction (MTJ), which are the structure parameters of an MTJ. These intrinsic parameters can be predetermined using the experimental measurement or, in principle, using the first-principle calculation method for an MTJ with the three key layers of FM/I/FM. Furthermore, a series of experimental data for an MTJ, for example, a spin-valve-type MTJ of Ta (5 nm)/Ni79Fe2.(2. nm)/lr2.Mn78(12.nm)/Co75Fe2.(4 nm)/AI(0.8 nm)-oxide/Co75Fe2.(4 nm)/Ni79Fe2.(2. nm)/Ta (5 nm) in this work, can be self-consistently evaluated and explained using such concise explicit function formulations.

关键词： Magnetic tunnel junction TMR Spin-electron transport Magnon excitation Spin-polarization Magnetotransport

Low Gilbert damping in Bi/In-doped YIG thin films with giant Faraday effect

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chinese physics B 2024年第10期33卷 419-426页

作者： Jin Zhan Yi Wang Xianjie Wang Hanxu Zhang Senyin Zhu Lingli Zhang Lingling Tao Yu Sui Wenqing He Caihua Wan xiufeng Han V.I.Belotelov Bo Song School of physics Harbin Institute of TechnologyHarbin 150001China beijing National laboratory for Condensed Matter {2. and Institute of PhysicsChinese Academy of SciencesBeijing 100190China Russian Quantum center Moscow 119991Russia National key laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China Zhengzhou Research institute Harbin Institute of TechnologyZhengzhou 450046China Frontiers Science center for Matter Behave in Space Environment Harbin Institute of TechnologyHarbin 150001China

Magnetic films with low Gilbert damping are crucial for magnonic devices,which provide a promising platform forrealizing ultralow-energy *** this study,low Gilbert damping and coercive field were observed in Bi/In-dopedyttrium iron garnet(BiIn:YIG)thin *** BiIn:YIG(444)films were deposited onto different substrates using pulsedlaser *** coercivity(2..09 emu/cc was achieved along the in-planedirection of BiIn:YIG *** values of Gilbert damping and inhomogeneous broadening of ferromagnetic resonance inBiIn:YIG films were obtained to be as low as 4.05×10^(-4)and 5.62.Oe,*** addition to low damping,the giantFaraday rotation angles(up to 2.9×10^(4)deg/cm)were also observed in the BiIn:YIG *** modifying the magneticstructure and coupling effect between Bi^(3.)and Fe^(3.)of Bi:YIG,doped In^(3.)plays a {3. role on variation of the *** low damping and giant Faraday effect made the BiIn:YIG film an appealing candidate for magnonic andmagneto-optical devices.

关键词： magnonic device Gilbert damping Faraday effect

Magnetic two-dimensional van derWaals materials for spintronic devices

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chinese physics B 2021年第11期30卷 12-21页

作者： Yu Zhang Hongjun Xu Jiafeng Feng Hao Wu Guoqiang Yu xiufeng Han beijing National laboratory for Condensed Matter {2. Institute of PhysicsChinese Academy of SciencesBeijing 100190China center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials laboratory Dongguan 523808China

Magnetic two-dimensional(2.)van derWaals(vdWs)materials and their heterostructures attract increasing attention in the spintronics community due to their various degrees of freedom such as spin,charge,and energy valley,which may stimulate potential applications in the field of low-power and high-speed spintronic devices in the *** review begins with introducing the long-range magnetic order in 2. vdWs materials and the recent progress of tunning their properties by electrostatic doping and ***,the proximity-effect,current-induced magnetization switching,and the related spintronic devices(such as magnetic tunnel junctions and spin valves)based on magnetic 2. vdWs materials are ***,the development trend of magnetic 2. vdWs materials is *** review provides comprehensive understandings for the development of novel spintronic applications based on magnetic 2. vdWs materials.

关键词： magnetic two-dimensional van der Waals materials spintronic devices

Nonreciprocal coherent coupling of nanomagnets by exchange spin waves

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Nano Research 2021年第7期14卷 2133-2138页

作者： Hanchen Wang Jilei Chen Tao Yu Chuanpu Liu Chenyang Guo Song Liu Ka Shen Hao Jia Tao Liu Jianyu Zhang Marco A.Cabero Z Qiuming Song Sa Tu Mingzhong Wu xiufeng Han Ke Xia Dapeng Yu Gerrit E.W.Bauer Haiming Yu Fert beijing institute School of Integrated Circuit Science and EngineeringBeijing Advanced Innovation Center for Big Data and Brain ComputingBeihang UniversityBeijing 100191China Max Planck institute for the Structure and Dynamics of Matter 22761 HamburgGermany beijing National laboratory for Condensed Matter {2. Institute of PhysicsUniversity of Chinese Academy of SciencesChinese Academy of SciencesBeijing 100190China Shenzhen institute for Quantum Science and Engineering(SIQSE) and Department of PhysicsSouthern University of Science and Technology(SUSTech)Shenzhen 518055China Department of physics Beijing Normal UniversityBeijing 100875China Department of physics Colorado State UniversityFort CollinsColorado 80523USA Kavli institute of Nanoscience Delft University of Technology2628 CJ DelftThe Netherlands institute for Materials Research WPI-AIMR and CSNRTohoku UniversitySendai 980-8577Japan Zernike institute for Advanced Materials University of GroningenGroningenNijenborgh 49747 AG GroningenThe Netherlands

Nanomagnets are widely used to store information in non-volatile spintronic *** waves can transfer information with low-power consumption as their propagations are independent of charge ***,to dynamically couple two distant nanomagnets via spin waves remains a major challenge for *** we experimentally demonstrate coherent coupling of two distant Co nanowires by fast propagating spin waves in an yttrium iron garnet thin film with sub-50 nm *** in two nanomagnets are unidirectionally phase-locked with phase shifts controlled by magnon spin torque and spin-wave *** coupled system is finally formulated by an analytical theory in terms of an effective non-Hermitian *** results are attractive for analog neuromorphic computing that requires unidirectional information transmission.

关键词： spintronics nanomagnets spin waves coherent coupling nonreciprocity

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 {2. 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 {2. 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(2.)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 3.0 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 3.0 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(2.) CrTe2 anisotropic magnetoresistance(AMR)

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

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chinese physics Letters 2023年第5期40卷 109-114页

作者：兰贵彬许洪军张雨程琛何斌李嘉辉何聪丽万蔡华丰家峰魏红祥张佳韩秀峰于国强 beijing National laboratory for Condensed Matter {2. Institute of PhysicsChinese Academy of SciencesBeijing 100190China center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials laboratory Dongguan 523808China institute of Advanced Materials Beijing Normal UniversityBeijing 100875China School of physics and Wuhan National High Magnetic Field center Huazhong University of Science and TechnologyWuhan 430074China

Two-dimensional van der Waals magnetic materials have demonstrated great potential for new-generation high-performance and versatile spintronic *** them,magnetic tunnel junctions(MTJs)based on A-type antiferromagnets,such as CrI_(3.,possess record-high tunneling magnetoresistance(TMR)because of the spin filter effect of each insulating unit ferromagnetic ***,the relatively low working temperature and the instability of the chromium halides hinder applications of this *** a different technical scheme,we fabricated the MTJs based on an air-stable A-type antiferromagnet,CrSBr,and observed a giant TMR of up to 47000%at 5 ***,because of a relatively high Néel temperature of CrSBr,a sizable TMR of about 50%was observed at 13. K,which makes a big step towards spintronic devices at room *** results reveal the potential of realizing magnetic information storage in CrSBr-based spin-filter MTJs.

关键词： temperature versatile chromium

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时间拉伸漂移管模拟技术

太赫兹科学与电子信息学报 2021年第3期19卷 448-452页

作者：孙江翁秀峰蔡丹张金海胡杨张鹏飞彭士香北京大学物理学院重离子物理研究所北京100871 强脉冲辐射环境模拟与效应国家重点实验室陕西西安710024

通过粒子模拟(PIC)的方法研究了可用于全高半宽度10 ps量级快脉冲光信号脉宽测量的时间拉伸漂移管。分别模拟了光阴极半径、加速管长度、加速电压、漂移区长度、螺线管中心磁场强度、初始光电子能量和初始光电流对时间拉伸漂移管展宽系... 详细信息

通过粒子模拟(PIC)的方法研究了可用于全高半宽度10 ps量级快脉冲光信号脉宽测量的时间拉伸漂移管。分别模拟了光阴极半径、加速管长度、加速电压、漂移区长度、螺线管中心磁场强度、初始光电子能量和初始光电流对时间拉伸漂移管展宽系数的影响。分析了时间拉伸漂移管展宽系数的主要影响因素,同时给出了漂移管展宽系数对初始电子能量和初始光电流的线性关系,证明了所设计的时间拉伸漂移管能够满足逆康普顿散射源的束长测量。研究结果可为逆康普顿散射源电子束长测量提供技术手段。

关键词：时间拉伸漂移管逆康普顿散射源粒子模拟束长度展宽系数

Nonlinear three-magnon scattering in low-damping La_(0.67)Sr_(0.3.)MnO_(3.thin films

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chinese physics B 2023年第10期32卷 139-144页

作者：张跃林盛路通陈济雷王婕朱增泰袁润东鲁京迪王涵晨郝思洁陈鹏于国强韩秀峰于海明 Fert beijing institute MIIT Key Laboratory of SpintronicsSchool of Integrated Circuit Science and EngineeringBeihang UniversityBeijing 100191China International Quantum academy Shenzhen 518048China Shenzhen institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518048China Department of physics Beijing Normal UniversityBeijing 100191China Songshan Lake Materials laboratory Dongguan 523808China Hefei National Research center for Physical sciences at the Microscale University of Science and Technology of ChinaHefei 230026China beijing National laboratory for Condensed Matter {2. Institute of PhysicsUniversity of Chinese Academy of SciencesChinese Academy of SciencesBeijing 100190China

Three-magnon scattering,a nonlinear process in which a high-energy magnon splits into two low-energy magnons with energy and momentum conservation,has been widely studied in the magnonics ***,we report experimental observation of nonlinear three-magnon scattering in La_(0.67)Sr_(0.3.)MnO_(3.thin films with low magnetic damping(~10^(-4))by all-electric and angle-resolved spin wave *** reflection spectra of the spin wave resonance with high-power excitation at Damon–Eshbach configuration demonstrate a scattering regime with gradual signal disappearance,where a magnon of Damon–Eshbach mode decays into two magnons of volume mode above the threshold power(-10 dBm)of the injected *** nonlinear scattering is only allowed at low-field regime and the calculated dispersions of dipole-exchange spin wave claim the mechanism of allowed and forbidden three-magnon *** films and heterostructures of La_(0.67)Sr_(0.3.)MnO_(3.have been already demonstrated with rich physical phenomena and great versatility,in this work the nonlinear magnetic dynamics of La_(0.67)Sr_(0.3.)MnO_(3.thin films is revealed,which offer more possibility for applications to oxide magnonics and nonlinear magnonic devices.

关键词： spin wave resonance nonlinear scattering LSMO films microwave antenna