Seifert, T.Jaiswal, S.Martens, U.Hannegan, J.Braun, L.Maldonado, P.Freimuth, F.Kronenberg, A.Henrizi, J.Radu, I.Beaurepaire, E.Mokrousov, Y.Oppeneer, P.M.Jourdan, M.Jakob, G.Turchinovich, D.Hayden, L. M.Wolf, M.Münzenberg, M.Kläui, M.Kampfrath, T.2021-08-272021-08-272016-05-23Seifert, T. et al.; Efficient metallic spintronic emitters of ultrabroadband terahertz radiation; Nature Photonics, volume 10, pages 483–488, 23 May, 2016; https://doi.org/10.1038/nphoton.2016.91https://doi.org/10.1038/nphoton.2016.91http://hdl.handle.net/11603/22711Terahertz electromagnetic radiation is extremely useful for numerous applications, including imaging and spectroscopy. It is thus highly desirable to have an efficient table-top emitter covering the 1–30 THz window that is driven by a low-cost, low-power femtosecond laser oscillator. So far, all solid-state emitters solely exploit physics related to the electron charge and deliver emission spectra with substantial gaps. Here, we take advantage of the electron spin to realize a conceptually new terahertz source that relies on three tailored fundamental spintronic and photonic phenomena in magnetic metal multilayers: ultrafast photoinduced spin currents, the inverse spin-Hall effect and a broadband Fabry–Pérot resonance. Guided by an analytical model, this spintronic route offers unique possibilities for systematic optimization. We find that a 5.8-nm-thick W/CoFeB/Pt trilayer generates ultrashort pulses fully covering the 1–30 THz range. Our novel source outperforms laser-oscillator-driven emitters such as ZnTe(110) crystals in terms of bandwidth, terahertz field amplitude, flexibility, scalability and cost.18 pagesen-USThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.Text