在本研究中,我们借由铁磁共振及反自旋霍尔效应所侦测到的抽运自旋电流,来研究Y $_3$ Fe $_5$ O $_{12}$(YIG)/ Gd $_3$ Fe $_5$ O $_{12}$(GdIG)/ Pt三层系统的动态响应。这三层系统提供了独特的机会,调查的亚铁磁GdIG的自旋动力学,接近其补偿温度。我们表明,我们的三层作为一个高度可调的自旋电源。我们的实验结果得到了微磁模拟的支持。由于在顶部Pt层中检测到的自旋电流明显由GdIG层主导,这提供了独特的机会来研究GdIG的激发和动态特性,同时将其与异质结构的宽带FMR吸收光谱进行比较。
英文摘要:
In this study, we investigate the dynamic response of a Y$_3$Fe$_5$O$_{12}$ (YIG)/ Gd$_3$Fe$_5$O$_{12}$ (GdIG)/ Pt trilayer system by measurements of the ferromagnetic resonance (FMR) and the pumped spin current detected by the inverse spin Hall effect. This trilayer system offers the unique opportunity to investigate the spin dynamics of the ferrimagnetic GdIG, close to its compensation temperature. We show that our trilayer acts as a highly tunable spin current source. Our experimental results are supported by micro-magnetic simulations. As the detected spin current in the top Pt layer is distinctly dominated by the GdIG layer, this gives the unique opportunity to investigate the excitation and dynamic properties of GdIG while comparing it to the broadband FMR absorption spectrum of the heterostructure.
Coupled spin dynamics in epitaxial trilayer heterostructures of ferrimagnetic garnet
Massachusetts Institute of Technology(麻省理工学院);Politecnico di Milano(米兰理工大学);Northeastern University(东北大学);Brno University of Technology(布尔诺理工大学);Heriot-Watt University(赫瑞瓦特大学)
Large spin pumping effect in antisymmetric precession of Ni$_{79}$Fe$_{21}$/Ru/Ni$_{79}$Fe$_{21}$
在磁性三层结构中,对铁磁共振的吉尔伯特阻尼的贡献来自于从一层泵送到另一层的自旋电流。这种贡献已被证明为层与弱耦合,分离的共振,其中磁化动力学激发主要在一个层和其他层作为自旋阱。在这里,我们表明,三层结构中的磁化被同时激发,反对称,显示自旋泵效应约两倍大。反铁磁耦合的Ni $_{79}$ Fe $_{21}$(8 nm)/Ru/Ni $_{79}$ Fe $_{21}$(8 nm)三层膜的反对称(光学)模式显示出比对称(声学)模式大的吉尔伯特阻尼常数,其量与Py($Δα\simeq\textrm{0.006}$)的本征阻尼一样大。在3-25 GHz范围内,场垂直和场平行于膜平面几何形状的效果是相同的。结果证实了自旋泵模型的预测,并在GHz的设备中使用的合成反铁磁体(SAF)的结构的影响。
Correlated interlayer quantum Hall state in large-angle twisted trilayer graphene
Daegu Gyeongbuk Institute of Science and Technology (DGIST)(大邱庆北科学技术院);Ulsan National Institute of Science and Technology(蔚山科学技术院);University of Seoul(首尔大学);Pohang University of Science and Technology(浦项科技大学);National Institute for Materials Science(物质材料研究机构);Korea Advanced Institute of Science and Technology(韩国科学技术院);Institute for Basic Science(基础科学研究所)
Correlated Electronic Structure and Density-Wave Gap in Trilayer Nickelate La4Ni3O10
Tsinghua University(清华大学);Lanzhou University(兰州大学);Songshan Lake Materials Laboratory(松山湖材料实验室);ShanghaiTech University(上海科技大学);University of Oxford(牛津大学)
Temperature-Dependent nonlinear optics from first-principles: Second-Harmonic Generation in few-layers MoS$_2$
Queen’s University Belfast(贝尔法斯特女王大学);European Theoretical Spectroscopy Facilities (ETSF)(欧洲理论光谱设施);CNRS/Aix-Marseille Université, Centre Interdisciplinaire de Nanoscience de Marseille UMR 7325(法国国家科学研究中心/艾克斯-马赛大学,马赛跨学科纳米科学中心 UMR 7325)
Electric-field induced trends of exchange interactions in transition-metal trilayers
Indian Institute of Science Education and Research Thiruvananthapuram(印度科学教育研究所特里凡得琅分校);Kiel Nano, Surface, and Interface Science (KiNSIS)(基尔纳米、表面与界面科学中心);Institute of Theoretical Physics and Astrophysics(理论物理与天体物理研究所);School of Physics(物理学院)
Light-induced interlayer spacing dynamics via orbital phonon coupling
Gwangju Institute of Science and Technology (GIST)(光州科学技术院);Max Planck Institute for the Structure and Dynamics of Matter(马克斯·普朗克物质结构与动力学研究所);Universidad del País Vasco UPV/EHU(巴斯克大学);The Flatiron Institute(平顶山研究所)
Weakly Coupled Motion of Individual Layers in Ferromagnetic Resonance
我们展示了一个层和时间分辨测量的铁磁共振(FMR)在Ni 81 Fe 19/ Cu /Co 93 Zr 7三层结构。时间分辨的X射线磁圆二色性已被开发的传输,在FMR频率为2.3 GHz的共振场激发。小角度(0.2度),时域磁化旋进可以直接观察到,并解决个别层通过元素对比在镍,铁,钴边缘。相位灵敏度允许直接测量各个元件和层的进动振荡中的相对相位滞后。一个弱的铁磁耦合,难以确定在传统的铁磁共振测量,揭示了跨谐振的各个层的相位和振幅响应。
Electronic Origin of Density Wave Orders in a Trilayer Nickelate
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences(中国科学院物理研究所凝聚态物理国家实验室);School of Physical Sciences, University of Chinese Academy of Sciences(中国科学院大学物理科学学院);Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-Sen University(中山大学物理学院广东省磁电物理与器件重点实验室);Technical Institute of Physics and Chemistry, Chinese Academy of Sciences(中国科学院化学物理研究所);Institute of Theoretical Physics, Chinese Academy of Sciences(中国科学院理论物理研究所)
Unveiling pressurized bulk superconductivity in a trilayer nickelate Pr4Ni3O10 single crystal
ShanghaiTech University(上海科技大学);Songshan Lake Materials Laboratory(松山湖材料实验室);Center for High Pressure Science and Technology Advanced Research(高压科学前沿研究中心);Institute for Shanghai Advanced Research in Physical Sciences (SHARPS)(上海物理科学研究院);Beijing University of Technology(北京工业大学);Japan Synchrotron Radiation Research Institute(日本同步辐射研究机构);University of Oxford(牛津大学);Tsinghua University(清华大学)