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MA: Fachverband Magnetismus
MA 12: Terahertz Spintronics
MA 12.6: Vortrag
Montag, 9. März 2026, 16:15–16:30, POT/0351
Tuning terahertz emission from spintronic devices via interface engineering — Rahul Gupta1,2, •Francesco Foggetti3, Francesco Cosco3, Venkatesh Mottamchetty4, Martin Pavelka3, Kasturie Jatkar5, Anders Rydberg3, Rimantas Brucas3, Peter M. Oppeneer3, and Peter Svedlindh3 — 1University of South Florida, Tampa, Florida, USA — 2University of Gothenburg, Gothenburg, Sweden — 3Uppsala University, Uppsala, Sweden — 4Aarhus University, Aarhus, Denmark — 5Stockholm University, Stockholm, Sweden
Spintronic terahertz (THz) emitters are emerging as compact and broadband sources. While common optimization approaches consist in the exploration of different materials and stacking geometries, the effects of the external interfaces have been poorly understood. Here we show that THz radiation amplitude from Pt/Fe grown on MgO and MgAl2O4 depends significantly on the interface reflection of spin currents, which is controlled by lattice mismatch and strain of the Fe/substrate interface, providing a powerful lever to tune THz emission. We use the superdiffusive transport theory to simulate the Pt/Fe bilayer, modeling the different interfaces via tunable interface reflection or via simulated substrate layer, resulting in very good agreement with the experimental data. Our results establish interface reflection governed by strain and lattice mismatch as a general design knob for optimizing spintronic THz emitters, opening new routes to engineer material platforms for next-generation THz technologies.
Keywords: Substrate; Interface; spintronics; Terahertz