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Recent developments in nanomagnetism and spintronics have enabled the use ofultrafast spin physics for terahertz (THz) emission. Spintronic THz emitters,consisting of ferromagnetic FM / non-magnetic (NM) thin film heterostructures,have demonstrated impressive properties for the use in THz spectroscopy andhave great potential in scientific and industrial applications. In this work,we focus on the impact of the FM/NM interface on the THz emission byinvestigating Fe/Pt bilayers with engineered interfaces. In particular, weintentionally modify the Fe/Pt interface by inserting an ordered L1$_{0}$-FePtalloy interlayer. Subsequently, we establish that a Fe/L1$_{0}$-FePt (2\,nm)/Ptconfiguration is significantly superior to a Fe/Pt bilayer structure, regardingTHz emission amplitude. The latter depends on the extent of alloying on eitherside of the interface. The unique trilayer structure opens new perspectives interms of material choices for the next generation of spintronic THz emitters.

THz emission from Fe/Pt spintronic emitters with L1$_{0}$-FePt alloyed interface