Spin-voltage-driven efficient terahertz spin currents from the magnetic Weyl semimetals Co2MnGa and Co2MnAl
Bierhance G, Markou A, Gueckstock O, Rouzegar R, Behovits Y, Chekhov AL, Wolf M, Seifert TS, Felser C, Kampfrath T (2022)
Publication Type: Journal article
Publication year: 2022
Journal
Book Volume: 120
Article Number: 082401
Journal Issue: 8
DOI: 10.1063/5.0080308
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 (170 fs) and Co2MnAl (100 fs), which is comparable to Fe (90 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 offer maximum spin-current amplitudes for a given deposited optical energy density.
Involved external institutions
Fritz-Haber-Institut der Max-Planck-Gesellschaft (FHI)
Germany (DE)
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
Germany (DE)
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
How to cite
APA:
Bierhance, G., Markou, A., Gueckstock, O., Rouzegar, R., Behovits, Y., Chekhov, A.L.,... Kampfrath, T. (2022). Spin-voltage-driven efficient terahertz spin currents from the magnetic Weyl semimetals Co2MnGa and Co2MnAl. Applied Physics Letters, 120(8). https://doi.org/10.1063/5.0080308
MLA:
Bierhance, Genaro, et al. "Spin-voltage-driven efficient terahertz spin currents from the magnetic Weyl semimetals Co2MnGa and Co2MnAl." Applied Physics Letters 120.8 (2022).
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