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Authors: Gueckstock, Oliver
Nádvorník, Lukáš
Gradhand, Martin
Seifert, Tom Sebastian
Bierhance, Genaro
Rouzegar, Reza
Wolf, Martin
Vafaee, Mehran
Cramer, Joel
Syskaki, Maria Andromachi
Woltersdorf, Georg
Mertig, Ingrid
Jakob, Gerhard
Kläui, Mathias
Kampfrath, Tobias
Title: Terahertz spin-to-charge conversion by interfacial skew scattering in metallic bilayers
Online publication date: 6-Apr-2021
Language: english
Abstract: The efficient conversion of spin to charge transport and vice versa is of major relevance for the detection and generation of spin currents in spin-based electronics. Interfaces of heterostructures are known to have a marked impact on this process. Here, terahertz (THz) emission spectroscopy is used to study ultrafast spin-to-charge-current conversion (S2C) in about 50 prototypical F|N bilayers consisting of a ferromagnetic layer F (e.g., Ni81Fe19, Co, or Fe) and a nonmagnetic layer N with strong (Pt) or weak (Cu and Al) spin-orbit coupling. Varying the structure of the F/N interface leads to a drastic change in the amplitude and even inversion of the polarity of the THz charge current. Remarkably, when N is a material with small spin Hall angle, a dominant interface contribution to the ultrafast charge current is found. Its magnitude amounts to as much as about 20% of that found in the F|Pt reference sample. Symmetry arguments and first-principles calculations strongly suggest that the interfacial S2C arises from skew scattering of spin-polarized electrons at interface imperfections. The results highlight the potential of skew scattering for interfacial S2C and propose a promising route to enhanced S2C by tailored interfaces at all frequencies from DC to terahertz.
DDC: 530 Physik
530 Physics
Institution: Johannes Gutenberg-Universität Mainz
Department: FB 08 Physik, Mathematik u. Informatik
Place: Mainz
Version: Published version
Publication type: Zeitschriftenaufsatz
Document type specification: Scientific article
License: CC-BY
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Journal: Advanced materials
Pages or article number: 2006281
Publisher: Wiley-VCH
Publisher place: Weinheim
Issue date: 2021
ISSN: 0935-9648
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Appears in collections:JGU-Publikationen

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