Terahertz Emission from Compensated Magnetic Heterostructures
Open accessAbstract
Terahertz emission spectroscopy (TES) has recently played an important role in unveiling the spin dynamics at a terahertz (THz) frequency range. So far, ferromagnetic/nonmagnetic heterostructures have been intensively studied as THz sources. Compensated magnets such as a ferrimagnet (FIM) and antiferromagnet (AFM) are other types of magnetic materials with interesting spin dynamics. In this work, TES from compensated magnetic heterostructures including CoGd FIM alloy or IrMn AFM layers is studied. Systematic measurements on composition and temperature dependences of THz emission from CoGd/Pt bilayer structures are conducted. It is found that the emitted THz field is determined by the net spin polarization of the laser‐induced spin current rather than the net magnetization. The temperature robustness of the FIM‐based THz emitter is also demonstrated. On the other hand, an AFM plays a different role in THz emission. The IrMn/Pt bilayer shows negligible THz signals, whereas Co/IrMn induces sizable THz outputs, indicating that IrMn is not a good spin current generator, but a good detector. These results not only suggest that a compensated magnet can be utilized for robust THz emission, but also provide a new approach to study the magnetization dynamics especially near the magnetization compensation point.
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Partially compensated ferrimagnetic materials such as CoGd support robust THz emission whose phase can be switched by an external magnetic field.
“partially compensated ferrimagnetic (FIM) materials, such as CoGd, have also been shown to support robust THz emission whose phase can be switched by an external magnetic field128.”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [128]
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- Authors
- Chen, M., Mishra, R., Wu, Y., Lee, K., & Yang, H.
- Affiliations
- National University of Singapore (SG)
- Corresponding author
- Yang, Hyunsoo
- Venue
- Advanced Optical Materials
- Publisher
- Wiley
- Published
- 2018-06-25
- Volume
- 6
- Issue
- 17
- ISSN
- 2195-1071 (ISSN-L)
- OpenAlex
- W2807227381
- Cited by
- 77
- References
- 38
- Citations by year
- 2026: 5 · 2025: 5 · 2024: 5 · 2023: 11 · 2022: 11 · 2021: 14 · 2020: 15 · 2019: 9 · 2018: 2
- FWCI
- 4.62
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- Advanced Optical Materials (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Funders
- National Research Foundation Singapore (NRF CRP12‐2013‐01)
- 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 › Condensed Matter Physics › Advanced Condensed Matter Physics
- Keywords
- terahertz emission, ferrimagnets, antiferromagnets, spin dynamics, spin polarization, magnetization dynamics, temperature robustness
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