Terahertz Spin Currents and Inverse Spin Hall Effect in Thin-Film Heterostructures Containing Complex Magnetic Compounds
Open accessAbstract
Terahertz emission spectroscopy (TES) of ultrathin multilayers of magnetic and heavy metals has recently attracted much interest. This method not only provides fundamental insights into photoinduced spin transport and spin–orbit interaction at highest frequencies, but has also paved the way for applications such as efficient and ultrabroadband emitters of terahertz (THz) electromagnetic radiation. So far, predominantly standard ferromagnetic materials have been exploited. Here, by introducing a suitable figure of merit, we systematically compare the strength of THz emission from [Formula: see text]/Pt bilayers with [Formula: see text] being a complex ferro-, ferri- and antiferromagnetic metal, that is, dysprosium cobalt (DyCo 5), gadolinium iron (Gd[Formula: see text]Fe[Formula: see text]), magnetite (Fe 3 O 4) and iron rhodium (FeRh). We find that the performance in terms of spin-current generation not only depends on the spin polarization of the magnet’s conduction electrons, but also on the specific interface conditions, thereby suggesting TES to be a highly interface-sensitive technique. In general, our results are relevant for all applications that rely on the optical generation of ultrafast spin currents in spintronic metallic multilayers.
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Further enhancements in THz emission amplitude can be achieved by tuning the FM layer to maximize the spin-polarization of the conduction electrons, improving interfacial quality, and optimizing the heterostructure geometry to maximize spin-to-charge current conversion.
“Further enhancements in emission amplitude can be achieved by tuning the FM layer to maximize the spin-polarization of the conduction electrons126, improving interfacial quality121, and optimizing the heterostructure geometry to maximize spin-to-charge current conversion127.”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [126]
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- Authors
- Seifert, T., Martens, U., Günther, S., Schoen, M. A. W., Radu, F., Chen, X. Z., Lucas, I., Ramos, R., Aguirre, M. H., Algarabel, P. A., Anadón, A., Körner, H. S., Walowski, J., Back, C., Ibarra, M. R., Morellón, L., Saitoh, E., Wolf, M., Song, C., Uchida, K., Münzenberg, M., Radu, I., & Kampfrath, T.
- Affiliations
- Fritz Haber Institute of the Max Planck Society (DE)
- Universität Greifswald (DE)
- ETH Zurich (CH)
- University of Regensburg (DE)
- Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy (DE)
- Tsinghua University (CN)
- Universidad de Zaragoza (ES)
- Tohoku University (JP)
- Consejo Superior de Investigaciones Científicas (ES)
- National Institute for Materials Science (JP)
- ORCID
- Venue
- SPIN
- Publisher
- World Scientific Pub Co Pte Lt
- Published
- 2017-09
- Volume
- 07
- Issue
- 03
- Pages
- 1740010
- ISSN
- 2010-3247 (ISSN-L)
- 2010-3255
- OpenAlex
- W2619711967
- Cited by
- 90
- References
- 45
- Citations by year
- 2026: 5 · 2025: 8 · 2024: 9 · 2023: 7 · 2022: 10 · 2021: 15 · 2020: 15 · 2019: 9 · 2018: 10 · 2017: 2
- FWCI
- 4.83
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- cc-by
- Locations
- SPIN (publishedVersion, cc-by)
- arXiv (Cornell University) (submittedVersion)
- MPG.PuRe (Max Planck Society) (submittedVersion, cc-by)
- DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion, cc-by)
- University of Regensburg Publication Server (University of Regensburg) (submittedVersion)
- Refubium (Universitätsbibliothek der Freien Universität Berlin) (submittedVersion, cc-by)
- Repository for Publications and Research Data (ETH Zurich) (submittedVersion, cc-by)
- Zaguan (University of Zaragoza Repository) (submittedVersion, cc-by)
- arXiv (Cornell University)
- Universitätsbibliothek der FU Berlin Hochschulschriftenstelle u. Dokumentenserver (cc-by)
- ETH Zürich Research Collection (cc-by)
- Funders
- Ministerio de Economía y Competitividad (MAT2014-51982-C-R, MAT2014-)
- Horizon 2020 Framework Programme (H2020-MSCA-RISE-2016, H2020-MSCA, H2020-MSCA-RISE, MSCA-RISE-2016, JP26103005, Grant No. 734187, JPMJER1402)
- Japan Society for the Promotion of Science (15H02012, 26103005, JP26103005, JPMJER1402, JPMJPR12C1)
- Precursory Research for Embryonic Science and Technology (JPMJPR12C1, JP26103005, JP15H02012, JPMJER1402)
- Exploratory Research for Advanced Technology (JP26103005, JP15H02012, JPMJPR12C1, JPMJER1402)
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Magnetic properties of thin films
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Terahertz technology and applications
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum and electron transport phenomena
- Keywords
- terahertz emission spectroscopy, inverse spin Hall effect, spin current, spin-orbit coupling, PT, GdFe2, magnetite, FeRh, spin polarization, interface effects, terahertz sources
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