Narrow-band tunable terahertz emission from ferrimagnetic Mn3-xGa thin films


Narrow-band tunable terahertz emission from ferrimagnetic Mn3-xGa thin films

Awari, N.; Kovalev, S.; Fowley, C.; Rode, K.; Gallardo, R. A.; Lau, Y.-C.; Betto, D.; Thiyagarajah, N.; Green, B.; Yildrim, O.; Lindner, J.; Fassbender, J.; Coey, J. M. D.; Deac, A. M.; Gensch, M.

Narrow-band terahertz emission from coherently excited spin precession in metallic Mn3-xGa Heusler alloy nanofilms has been observed. The efficiency of the emission, per nanometer film thickness, is comparable or higher than that of classical laser-driven terahertz sources based on optical rectification. The center frequency of the emission from the films can be tuned precisely via the film composition making this type of metallic films a candidate for efficient on-chip terahertz emitters. Terahertz emission spectroscopy is potentially a sensitive probe of magnetic properties of ultra-thin films.

Keywords: THz emission; ferrimagnets; spin excitations

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Publ.-Id: 23677