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Open access
Springer Nature
npj Spintronics
,  volume 2 ,  issue 1 ,  publication number 58

THz generation by exchange-coupled spintronic emitters

Adam Roman 1
, 
Derang Cao 1, 2
, 
DANIEL E. BÜRGLER 1
, 
Sarah Heidtfeld 1, 3
, 
Fangzhou Wang 1, 3
, 
Christian Greb 1, 3
, 
JING CHENG 4, 5
, 
Debamitra Chakraborty 4, 5
, 
Ivan Komissarov 5, 6
, 
Markus Büscher 1, 7
, 
Martin Mikulics 8
, 
Hilde Hardtdegen 8
, 
Roman Sobolewski 5, 6
, 
CLAUS M. SCHNEIDER 1, 3
1
 
2
 
3
 
4
 
5
 
6
 
7
 
8
 
Publication type: Journal Article
Publication date: 2024-11-29
Springer Nature
SJR: —
CiteScore: —
Impact factor: —
ISSN: 29482119
Abstract

The mechanism of THz generation in ferromagnet/metal (F/M) bilayers has been typically ascribed to the inverse spin Hall effect (ISHE). Here, we fabricated Pt/Fe/Cr/Fe/Pt multilayers containing two back-to-back spintronic THz emitters separated by a thin (tCr≤ 3nm) wedge-shaped Cr spacer. In such an arrangement, magnetization alignment of the two Fe films can be controlled by the interplay between Cr-mediated interlayer exchange coupling (IEC) and an external magnetic field. This in turn results in a strong variation of the THz amplitude A, with A↑↓ reaching up to 14 times A↑↑ (arrows indicate the relative alignment of the magnetization of the two magnetic layers). This observed functionality is ascribed to the interference of THz transients generated by two closely spaced THz emitters. Moreover, the magnetic field dependence A(H) shows a strong asymmetry that points to an additional performance modulation of the THz emitter via IEC and multilayer design.

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Roman A. et al. THz generation by exchange-coupled spintronic emitters // npj Spintronics. 2024. Vol. 2. No. 1. 58
GOST all authors (up to 50) Copy
Roman A., Cao D., BÜRGLER D. E., Heidtfeld S., Wang F., Greb C., CHENG J., Chakraborty D., Komissarov I., Büscher M., Mikulics M., Hardtdegen H., Sobolewski R., SCHNEIDER C. M. THz generation by exchange-coupled spintronic emitters // npj Spintronics. 2024. Vol. 2. No. 1. 58
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TY - JOUR
DO - 10.1038/s44306-024-00061-0
UR - https://www.nature.com/articles/s44306-024-00061-0
TI - THz generation by exchange-coupled spintronic emitters
T2 - npj Spintronics
AU - Roman, Adam
AU - Cao, Derang
AU - BÜRGLER, DANIEL E.
AU - Heidtfeld, Sarah
AU - Wang, Fangzhou
AU - Greb, Christian
AU - CHENG, JING
AU - Chakraborty, Debamitra
AU - Komissarov, Ivan
AU - Büscher, Markus
AU - Mikulics, Martin
AU - Hardtdegen, Hilde
AU - Sobolewski, Roman
AU - SCHNEIDER, CLAUS M.
PY - 2024
DA - 2024/11/29
PB - Springer Nature
IS - 1
VL - 2
SN - 2948-2119
ER -
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@article{2024_Roman,
author = {Adam Roman and Derang Cao and DANIEL E. BÜRGLER and Sarah Heidtfeld and Fangzhou Wang and Christian Greb and JING CHENG and Debamitra Chakraborty and Ivan Komissarov and Markus Büscher and Martin Mikulics and Hilde Hardtdegen and Roman Sobolewski and CLAUS M. SCHNEIDER},
title = {THz generation by exchange-coupled spintronic emitters},
journal = {npj Spintronics},
year = {2024},
volume = {2},
publisher = {Springer Nature},
month = {nov},
url = {https://www.nature.com/articles/s44306-024-00061-0},
number = {1},
pages = {58},
doi = {10.1038/s44306-024-00061-0}
}