2020/08/21 by Evangelos Th. Papaioannou, Papaioannou, Evangelos Th., Laura Scheuer +9 · 1 citation
Engineering · Physics and Astronomy · #Applied Physics (physics.app-ph) #FOS: Physical sciences #Magnetic properties of thin films #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Molecular Junctions and Nanostructures #Quantum and electron transport phenomena
paper · pdf · doi:10.48550/arxiv.2008.09537
openalex publication_date 2020/08/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The field of THz spintronics is a novel direction in the research field of\nspintronics that combines magnetism with optical physics and ultrafast\nphotonics. The experimental scheme of the field involves the use of femtosecond\nlaser pulses to trigger ultrafast spin and charge dynamics in bilayers composed\nof ferromagnetic (FM) and non-magnetic (NM) thin films where the NM layer\nfeatures a strong spin-orbit coupling. The key technological and scientific\nchallenges of THz spintronic emitters is to increase their intensity and\nfrequency bandwidth. To achieve this the control of the source of the\nradiation, namely the transport of the ultrafast spin current is required.\nHowever, the transfer of a spin current from a FM to a NM layer is a highly\ninterface-sensitive effect. In this work we study the properties of the spin\ncurrent transport through the interface measuring the strength of the THz\nemission and compare it to the effective spin mixing conductance, one of the\nkey concepts in the spin current transport through interfaces. The results show\nan enhancement of the spin mixing conductance for interfaces with higher degree\nof epitaxy similarly to the improvement of the THz emission. The\nproportionality between spin mixing conductance and THz emission can define new\ndirections in engineering the emission of spintronic THz emitters.\n