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Terahertz (THz) radiation, covering frequencies from 300 GHz to 30 THz, enables access to physical, chemical, and biological phenomena that are otherwise difficult to probe, with applications ranging from high-speed communications to medical diagnostics. Spintronic emitters based on ferromagnet/heavy-metal bilayers excited by femtosecond laser pulses have become key broadband THz sources, where emission is driven by the inverse spin Hall effect (ISHE). However, the influence of interfacial properties on spin-to-charge conversion remains an open question. This work introduces tunnel spintronic emitters consisting of a ferromagnetic FeCo layer and a Pt layer separated by an MgO tunnel barrier. Experiments reveal that, unlike conventional bilayers where THz polarization is governed by the ferromagnetic magnetization and tunable with an external field, tunnel emitters exhibit unconventional polarization behavior. These findings point to new interfacial mechanisms that will be discussed.
Wykład będzie prowadzony w języku angielskim w sali 203. Dostępna będzie również transmisja ZOOM.