Spin-voltage-driven efficient terahertz spin currents from the magnetic Weyl 
semimetals Co2MnGa and Co2MnAl

Bierhance, Genaro; Markou, Anastasios; Gückstock, Oliver; Rouzegar, Seyed Mohammedreza; Behovits, Yannic; Chekhov, Alexander; Wolf, Martin; Seifert, Tom; Felser, Claudia; Kampfrath, Tobias

doi:10.1063/5.0080308

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Spin-voltage-driven efficient terahertz spin currents from the magnetic Weyl semimetals Co₂MnGa and Co₂MnAl

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Bierhance, Genaro
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Freie Universität Berlin, Fachbereich Physik;

Markou, Anastasios
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Gückstock, Oliver
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Freie Universität Berlin, Fachbereich Physik;

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Rouzegar, Seyed Mohammedreza
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Freie Universität Berlin, Fachbereich Physik;

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Behovits, Yannic
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Freie Universität Berlin, Fachbereich Physik;

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Chekhov, Alexander
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Freie Universität Berlin, Fachbereich Physik;

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Wolf, Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Seifert, Tom
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Freie Universität Berlin, Fachbereich Physik;

Felser, Claudia
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Kampfrath, Tobias
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Freie Universität Berlin, Fachbereich Physik;

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Citation

Bierhance, G., Markou, A., Gückstock, O., Rouzegar, S. M., Behovits, Y., Chekhov, A., et al. (2022). Spin-voltage-driven efficient terahertz spin currents from the magnetic Weyl semimetals Co₂MnGa and Co₂MnAl. Applied Physics Letters, 120(8): 082401. doi:10.1063/5.0080308.

Cite as: https://hdl.handle.net/21.11116/0000-0009-9783-8

Abstract

Magnetic Weyl semimetals are an emerging material class that combines
magnetic order and a topologically non-trivial band structure. Here, we study
ultrafast optically driven spin injection from thin films of the magnetic Weyl
semimetals Co₂MnGa and Co₂MnAl into an adjacent Pt layer by means of
terahertz emission spectroscopy. We find that (i) Co₂MnGa and Co₂MnAl are
efficient terahertz spin-current generators reaching efficiencies of typical
3d-transition-metal ferromagnets such as Fe. (ii) The relaxation of the spin
current provides an estimate of the electron-spin relaxation time of Co₂MnGa
(165 fs) and Co₂MnAl (102 fs), which is comparable to Fe (92 fs). Both
observations are consistent with a simple analytical model and highlight the
large potential of magnetic Weyl semimetals as spin-current sources in
terahertz spintronic devices. Finally, our results provide a strategy to
identify magnetic materials that provide maximum spin current amplitudes for a
given deposited optical energy density.