Modification of spintronic terahertz emitter performance through defect engineering
AuthorNenno, Dennis M
Binder, Rolf H
Schneider, Hans C
Papaioannou, Evangelos Th
AffiliationUniv Arizona, Ctr Opt Sci
MetadataShow full item record
PublisherNATURE PUBLISHING GROUP
CitationNenno, D. M., Scheuer, L., Sokoluk, D., Keller, S., Torosyan, G., Brodyanski, A., ... & Schneider, H. C. (2019). Modification of spintronic terahertz emitter performance through defect engineering. Scientific reports, 9(1), 1-16.
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AbstractSpintronic ferromagnetic/non-magnetic heterostructures are novel sources for the generation of THz radiation based on spin-to-charge conversion in the layers. The key technological and scientific challenge of THz spintronic emitters is to increase their intensity and frequency bandwidth. Our work reveals the factors to engineer spintronic Terahertz generation by introducing the scattering lifetime and the interface transmission for spin polarized, non-equilibrium electrons. We clarify the influence of the electron-defect scattering lifetime on the spectral shape and the interface transmission on the THz amplitude, and how this is linked to structural defects of bilayer emitters. The results of our study define a roadmap of the properties of emitted as well as detected THz-pulse shapes and spectra that is essential for future applications of metallic spintronic THz emitters.
NoteOpen access journal
VersionFinal published version
SponsorsDeutsche Forschungsgemeinschaft (DFG) through the collaborative research centerGerman Research Foundation (DFG) [SFB TRR 173]; Carl-Zeiss-Foundation; Graduate School of Excellence MAINZ (Excellence Initiative DFG) [GSC 266];[SFB/TRR 173]