Autoren:	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
Titel:	Terahertz spin-to-charge conversion by interfacial skew scattering in metallic bilayers
Online-Publikationsdatum:	6-Apr-2021
Erscheinungsdatum:	2021
Sprache des Dokuments:	Englisch
Zusammenfassung/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-Sachgruppe:	530 Physik 530 Physics
Veröffentlichende Institution:	Johannes Gutenberg-Universität Mainz
Organisationseinheit:	FB 08 Physik, Mathematik u. Informatik
Veröffentlichungsort:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-5709
Version:	Published version
Publikationstyp:	Zeitschriftenaufsatz
Weitere Angaben zur Dokumentart:	Scientific article
Nutzungsrechte:	CC BY
Informationen zu den Nutzungsrechten:	https://creativecommons.org/licenses/by/4.0/
Zeitschrift:	Advanced materials 33 9
Seitenzahl oder Artikelnummer:	2006281
Verlag:	Wiley-VCH
Verlagsort:	Weinheim
Erscheinungsdatum:	2021
ISSN:	0935-9648
URL der Originalveröffentlichung:	https://doi.org/10.1002/adma.202006281
DOI der Originalveröffentlichung:	10.1002/adma.202006281
Enthalten in den Sammlungen:	JGU-Publikationen