Spectral Properties of Terahertz Radiation from Laterally Structured Spintronic Emitters

IF 1.4 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY
E. A. Karashtin, N. S. Gusev, M. V. Sapozhnikov, P. Yu. Avdeev, A. L. Alfer’ev, E. D. Lebedeva, A. M. Buryakov, E. D. Mishina
{"title":"Spectral Properties of Terahertz Radiation from Laterally Structured Spintronic Emitters","authors":"E. A. Karashtin,&nbsp;N. S. Gusev,&nbsp;M. V. Sapozhnikov,&nbsp;P. Yu. Avdeev,&nbsp;A. L. Alfer’ev,&nbsp;E. D. Lebedeva,&nbsp;A. M. Buryakov,&nbsp;E. D. Mishina","doi":"10.1134/S0021364024604639","DOIUrl":null,"url":null,"abstract":"<p>In this work, the spectral properties of the terahertz radiation of a spintronic emitter based on the Co(2 nm)/Pt(2 nm) ferromagnet/heavy metal heterostructure and the periodic system of strips made of it (period from 4 μm to 1 mm) have been experimentally studied. Two main mechanisms that determine the terahertz spectrum of such emitters are demonstrated. The first of them is observed both in a continuous multilayer film and in a periodic lattice. In this mechanism, due to the interference of signals from different spatial regions of the emitter, the amplitude of the wave decreases with an increase in the angle between the normal to the film and the direction of radiation propagation, and the characteristic scale of this decrease depends on the wavelength. As a result, the increase in this angle is accompanied by the redshift of the spectral amplitude maximum of radiation. The second mechanism is possible only in the periodic system of strips. It occurs as the fact suppression of terahertz radiation due to the charge accumulation at the boundaries of the strips when periodic lattices with a short period are magnetized along the strips. This effect is more significant for longer wavelengths and is therefore accompanied by a blueshift of the spectral maximum. The mechanisms studied in this work will make it possible to create spintronic emitters of terahertz radiation with a given position of the spectral amplitude maximum of terahertz radiation.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 3","pages":"195 - 201"},"PeriodicalIF":1.4000,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024604639.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"JETP Letters","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1134/S0021364024604639","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0

Abstract

In this work, the spectral properties of the terahertz radiation of a spintronic emitter based on the Co(2 nm)/Pt(2 nm) ferromagnet/heavy metal heterostructure and the periodic system of strips made of it (period from 4 μm to 1 mm) have been experimentally studied. Two main mechanisms that determine the terahertz spectrum of such emitters are demonstrated. The first of them is observed both in a continuous multilayer film and in a periodic lattice. In this mechanism, due to the interference of signals from different spatial regions of the emitter, the amplitude of the wave decreases with an increase in the angle between the normal to the film and the direction of radiation propagation, and the characteristic scale of this decrease depends on the wavelength. As a result, the increase in this angle is accompanied by the redshift of the spectral amplitude maximum of radiation. The second mechanism is possible only in the periodic system of strips. It occurs as the fact suppression of terahertz radiation due to the charge accumulation at the boundaries of the strips when periodic lattices with a short period are magnetized along the strips. This effect is more significant for longer wavelengths and is therefore accompanied by a blueshift of the spectral maximum. The mechanisms studied in this work will make it possible to create spintronic emitters of terahertz radiation with a given position of the spectral amplitude maximum of terahertz radiation.

侧向结构自旋电子发射器太赫兹辐射的光谱特性
在这项研究中,我们通过实验研究了基于 Co(2 nm)/Pt(2 nm) 铁磁体/重金属异质结构的自旋电子发射器及其周期性条带系统(周期从 4 μm 到 1 mm)的太赫兹辐射光谱特性。实验证明了决定此类发射器太赫兹频谱的两个主要机制。第一种机制在连续多层薄膜和周期晶格中都能观察到。在这种机制中,由于来自发射器不同空间区域的信号相互干扰,波幅会随着薄膜法线与辐射传播方向之间夹角的增大而减小,这种减小的特征尺度取决于波长。因此,该角度的增大伴随着辐射光谱振幅最大值的红移。第二种机制只有在周期性条带系统中才有可能出现。当周期较短的周期晶格沿条带磁化时,由于条带边界的电荷积累,太赫兹辐射会受到抑制。这种效应在波长较长时更为明显,因此伴随着光谱最大值的蓝移。这项工作所研究的机制将使我们有可能制造出具有特定太赫兹辐射光谱振幅最大值位置的太赫兹自旋电子发射器。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
JETP Letters
JETP Letters 物理-物理:综合
CiteScore
2.40
自引率
30.80%
发文量
164
审稿时长
3-6 weeks
期刊介绍: All topics of experimental and theoretical physics including gravitation, field theory, elementary particles and nuclei, plasma, nonlinear phenomena, condensed matter, superconductivity, superfluidity, lasers, and surfaces.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信