2021/03/17 by J. Hawecker, T. H. Dang, Hawecker, Jacques +26
Engineering · Physics and Astronomy · #FOS: Physical sciences #Gyrotron and Vacuum Electronics Research #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum and electron transport phenomena #Terahertz technology and applications
paper · pdf · doi:10.48550/arxiv.2103.09557
openalex publication_date 2021/03/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Terahertz (THz) spin-to-charge conversion has become an increasingly\nimportant process for THz pulse generation and as a tool to probe ultrafast\nspin interactions at magnetic interfaces. However, its relation to traditional,\nsteady state, ferromagnetic resonance techniques is poorly understood. Here we\ninvestigate nanometric trilayers of Co/X/Pt (X=Ti, Au or Au0:85W0:15) as a\nfunction of the 'X' layer thickness, where THz emission generated by the\ninverse spin Hall effect is compared to the Gilbert damping of the\nferromagnetic resonance. Through the insertion of the 'X' layer we show that\nthe ultrafast spin current injected in the non-magnetic layer defines a direct\nspin conductance, whereas the Gilbert damping leads to an effective spin\nmixing-conductance of the trilayer. Importantly, we show that these two\nparameters are connected to each other and that spin-memory losses can be\nmodeled via an effective Hamiltonian with Rashba fields. This work highlights\nthat magneto-circuits concepts can be successfully extended to ultrafast\nspintronic devices, as well as enhancing the understanding of spin-to-charge\nconversion processes through the complementarity between ultrafast THz\nspectroscopy and steady state techniques.\n