Modification of spintronic terahertz emitter performance through defect engineering

Dennis M. Nenno, Laura Scheuer, Dominik Sokoluk, Sascha Keller, Garik Torosyan, Alexander Brodyanski, Jörg Lösch, Marco Battiato, Marco Rahm, Rolf H. Binder, Hans C. Schneider, René Beigang, Evangelos Th Papaioannou

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Spintronic 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.

Original languageEnglish (US)
Article number13348
JournalScientific reports
Volume9
Issue number1
DOIs
StatePublished - Dec 1 2019

ASJC Scopus subject areas

  • General

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    Nenno, D. M., Scheuer, L., Sokoluk, D., Keller, S., Torosyan, G., Brodyanski, A., Lösch, J., Battiato, M., Rahm, M., Binder, R. H., Schneider, H. C., Beigang, R., & Papaioannou, E. T. (2019). Modification of spintronic terahertz emitter performance through defect engineering. Scientific reports, 9(1), [13348]. https://doi.org/10.1038/s41598-019-49963-8