Modification of spintronic terahertz emitter performance through defect engineering

Modification of spintronic terahertz emitter performance through defect engineering

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 re...

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Bibliographic Details
Main Authors: Nenno, Dennis M., Scheuer, Laura, Sokoluk, Dominik, Keller, Sascha, Torosyan, Garik, Brodyanski, Alexander, Lösch, Jörg, Battiato, Marco, Rahm, Marco, Binder, Rolf H., Schneider, Hans Christian, Beigang, René, Papaioannou, Evangelos Th.
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2020
Subjects:
Science::Physics
Spintronic Terahertz Emitter
Electron
Online Access:https://hdl.handle.net/10356/142339
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Institution: Nanyang Technological University
Language: English
Description
Summary: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.

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