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

Gückstock, Oliver; Seeger, R. L.; Seifert, Tom; Auffret, S.; Gambarelli, S.; Kirchhof, J. N.; Bolotin, K. I.; Baltz, V.; Kampfrath, Tobias; Nádvorník, L.

doi:10.1063/5.0077868

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学術論文

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

MPS-Authors

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Gückstock, Oliver
Department of Physics, Freie Universität Berlin;
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Seifert, Tom
Department of Physics, Freie Universität Berlin;
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons21693

Kampfrath, Tobias
Department of Physics, Freie Universität Berlin;
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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引用

Gückstock, O., Seeger, R. L., Seifert, T., Auffret, S., Gambarelli, S., Kirchhof, J. N., Bolotin, K. I., Baltz, V., Kampfrath, T., & Nádvorník, L. (2022). Impact of gigahertz and terahertz transport regimes on spin propagation and conversion in the antiferromagnet IrMn. Applied Physics Letters, 120(6):. doi:10.1063/5.0077868.

引用: https://hdl.handle.net/21.11116/0000-000A-08F0-E

要旨

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.