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  Spintronic THz emitters based on transition metals and semi-metals/Pt multilayers

Hawecker, J., Rongione, E., Markou, A., Krishnia, S., Godel, F., Collin, S., et al. (2022). Spintronic THz emitters based on transition metals and semi-metals/Pt multilayers. Applied Physics Letters, 120(12): 122406, pp. 1-7. doi:10.1063/5.0079955.

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 Creators:
Hawecker, J.1, Author
Rongione, E.1, Author
Markou, A.2, Author              
Krishnia, S.1, Author
Godel, F.1, Author
Collin, S.1, Author
Lebrun, R.1, Author
Tignon, J.1, Author
Mangeney, J.1, Author
Boulier, T.1, Author
George, J.-M.1, Author
Felser, C.3, Author              
Jaffrès, H.1, Author
Dhillon, S.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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Free keywords: Interfaces (materials); Light absorption; Spin Hall effect; Spin polarization; Structural optimization; Transition metals, Design control; Design materials; Emission properties; Nanometer level; Optical-; Semi-metals; Tera Hertz; Terahertz emissions; Terahertz emitters; Terahertz pulse generation, Terahertz spectroscopy
 Abstract: Spintronic terahertz (THz) emitters based on the inverse spin Hall effect in ferromagnetic/heavy metal (FM/HM) heterostructures have become important sources for THz pulse generation. The design, materials, and control of these interfaces at the nanometer level have become vital to engineer their THz emission properties. In this work, we present studies of the optimization of such structures through a multi-pronged approach, taking advantage of material and interface engineering to enhance THz spintronic emission. This includes the application of multi-stacks of HM/FM junctions and their application to trilayer structures, the use of spin-sinks to simultaneously enhance the THz emitted fields and reduce the use of thick Pt layers to reduce optical absorption, and the use of semi-metals to increase the spin polarization and, thus, THz emission. Through these approaches, significant enhancements of the THz field can be achieved. Importantly, taking into account the optical absorption permits to elucidate novel phenomena such as the relation between the spin diffusion length and the spin-sink using THz spectroscopy, as well as possibly distinguishing between self- and interface-spin-to-charge conversion in semi-metals. © 2022 Author(s).

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Language(s): eng - English
 Dates: 2022-03-242022-03-24
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1063/5.0079955
BibTex Citekey: Hawecker2022
 Degree: -

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Title: Applied Physics Letters
  Abbreviation : Appl. Phys. Lett.
Source Genre: Journal
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Publ. Info: Melville, NY : American Institute of Physics
Pages: - Volume / Issue: 120 (12) Sequence Number: 122406 Start / End Page: 1 - 7 Identifier: ISSN: 0003-6951
CoNE: https://pure.mpg.de/cone/journals/resource/954922836223