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  Impact of gigahertz and terahertz transport regimes on spin propagation and conversion in the antiferromagnet IrMn

Gückstock, O., Seeger, R. L., Seifert, T., Auffret, S., Gambarelli, S., Kirchhof, J. N., et al. (2022). Impact of gigahertz and terahertz transport regimes on spin propagation and conversion in the antiferromagnet IrMn. Applied Physics Letters, 120(6): 062408. doi:10.1063/5.0077868.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000A-08F0-E Version Permalink: https://hdl.handle.net/21.11116/0000-000E-36E2-6
Genre: Journal Article

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 Creators:
Gückstock, Oliver1, 2, Author           
Seeger, R. L.3, Author
Seifert, Tom1, 2, Author           
Auffret, S.3, Author
Gambarelli, S.4, Author
Kirchhof, J. N.1, Author
Bolotin, K. I.1, Author
Baltz, V.3, Author
Kampfrath, Tobias1, 2, Author           
Nádvorník, L.5, Author
Affiliations:
1Department of Physics, Freie Universität Berlin, 14195 Berlin, Germany, ou_persistent22              
2Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
3Univ. Grenoble Alpes, CNRS, CEA, Grenoble INP, IRIG-SPINTEC, F-38000 Grenoble, France, ou_persistent22              
4Univ. Grenoble Alpes, CNRS, CEA, SYMMES, F-38000 Grenoble, France, ou_persistent22              
5Faculty of Mathematics and Physics, Charles University, 121 16 Prague, Czech Republic, ou_persistent22              

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 Abstract: Control over spin transport in antiferromagnetic systems is essential for future spintronic applications with operational speeds extending to
ultrafast time scales. Here, we study the transition from the gigahertz (GHz) to terahertz (THz) regime of spin transport and spin-to-charge
current conversion (S2C) in the prototypical antiferromagnet IrMn by employing spin pumping and THz spectroscopy techniques. We
reveal a factor of 4 shorter characteristic propagation lengths of the spin current at THz frequencies (~0.5 nm) as compared to GHz
experiments (~2 nm). This observation may be attributed to different transport regimes. The conclusion is supported by extraction of sub-
picosecond temporal dynamics of the THz spin current. We identify no relevant impact of the magnetic order parameter on S2C signals and
no scalable magnonic transport in THz experiments. A significant role of the S2C originating from interfaces between IrMn and magnetic or
non-magnetic metals is observed, which is much more pronounced in the THz regime and opens the door for optimization of the spin control at ultrafast time scales.

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Language(s): eng - English
 Dates: 2021-11-072022-01-262022-02-092022-02
 Publication Status: Issued
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1063/5.0077868
 Degree: -

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Project name : TERAMAG - Ultrafast spin transport and magnetic order controlled by terahertz electromagnetic pulses
Grant ID : 681917
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)
Project name : ASPIN - Antiferromagntic spintronics
Grant ID : 766566
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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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: 7 Volume / Issue: 120 (6) Sequence Number: 062408 Start / End Page: - Identifier: ISSN: 0003-6951
CoNE: https://pure.mpg.de/cone/journals/resource/954922836223