Spintronic terahertz emitters: Status and prospects from a materials perspective
Spintronic terahertz emitters: Status and prospects from a materials perspective
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DOI：
10.1063/5.0057511
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发表时间：
2021-09-01
期刊：
影响因子：
6.1
通讯作者：
Nutter, Paul W.
中科院分区：
文献类型：
--
作者：
Bull, Charlotte;Hewett, Simmone M.;Nutter, Paul W.
自旋电子太赫兹(THz)发射体由铁磁性(FM)/非磁性(NM)薄膜组成，在THz时域光谱及其在科学和工业应用中的开发方面显示出巨大的潜力。自从发现新型的FM/NM异质结可以作为太赫兹辐射源以来，研究人员一直在努力寻找材料的最佳组合，以制造能够在大光谱带宽上产生THz辐射脉冲的理想自旋电子发射器。在过去的十年里，研究人员研究了一系列材料性质的影响，包括材料的选择和层的厚度，FM/NM界面的质量，以及叠层几何形状对THz辐射的影响。已经发现，这些特性的特定组合极大地改善了发射的太赫兹脉冲的幅度和带宽。重要的是，研究自旋电子太赫兹发射体的材料特性增加了对自旋到电荷电流转换过程的理解，这些过程涉及到太赫兹辐射的产生。最终，这促进了自旋电子异质结构的发展，这种结构可以在不施加外部磁场的情况下发射太赫兹辐射。在这篇综述中，我们全面概述了导致自旋电子太赫兹发射体发展的实验和理论发现，这些发射体有望在广泛的太赫兹应用中使用。我们总结了目前对自旋电子异质结产生THz辐射的机制的理解，并探讨了材料性质对发射过程的影响。(C)2021年作者(S)。除另有说明外，所有文章内容均受知识共享署名(CC By)license(http://creativecommons.org/licenses/by/4.0/).许可
Spintronic terahertz (THz) emitters, consisting of ferromagnetic (FM)/non-magnetic (NM) thin films, have demonstrated remarkable potential for use in THz time-domain spectroscopy and its exploitation in scientific and industrial applications. Since the discovery that novel FM/NM heterostructures can be utilized as sources of THz radiation, researchers have endeavored to find the optimum combination of materials to produce idealized spintronic emitters capable of generating pulses of THz radiation over a large spectral bandwidth. In the last decade, researchers have investigated the influence of a wide range of material properties, including the choice of materials and thicknesses of the layers, the quality of the FM/NM interface, and the stack geometry upon the emission of THz radiation. It has been found that particular combinations of these properties have greatly improved the amplitude and bandwidth of the emitted THz pulse. Significantly, studying the material properties of spintronic THz emitters has increased the understanding of the spin-to-charge current conversion processes involved in the generation of THz radiation. Ultimately, this has facilitated the development of spintronic heterostructures that can emit THz radiation without the application of an external magnetic field. In this review, we present a comprehensive overview of the experimental and theoretical findings that have led to the development of spintronic THz emitters, which hold promise for use in a wide range of THz applications. We summarize the current understanding of the mechanisms that contribute to the emission of THz radiation from the spintronic heterostructures and explore how the material properties contribute to the emission process. (c) 2021 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license(http://creativecommons.org/licenses/by/4.0/).