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
Year of first publication:	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
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-5709
Version:	Published version
Publication type:	Zeitschriftenaufsatz
Document type specification:	Scientific article
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/4.0/
Journal:	Advanced materials 33 9
Pages or article number:	2006281
Publisher:	Wiley-VCH
Publisher place:	Weinheim
Issue date:	2021
ISSN:	0935-9648
Publisher URL:	https://doi.org/10.1002/adma.202006281
Publisher DOI:	10.1002/adma.202006281
Appears in collections:	JGU-Publikationen