Electronic transparency of internal interfaces in metallic nanostructures comprising light, heavy and ferromagnetic metals measured by terahertz spectroscopy
Author:
Beermann Nicolas S.1, Fabretti Savio1, Hafez Hassan A.1, Syskaki Maria-Andromachi2, Kononenko Iryna2, Jakob Gerhard2, Kläui Mathias2, Turchinovich Dmitry1ORCID
Affiliation:
1. Fakultät für Physik , Universität Bielefeld , Universitätsstr. 25, 33615 Bielefeld , Germany 2. Institute of Physics , Johannes Gutenberg Universität Mainz , Staudinger Weg 7, 55128 Mainz , Germany
Abstract
Abstract
We investigate the electronic transport at the internal interface within a selection of metallic bilayer nanostructures using the contact-free, all-optical method of THz time-domain spectroscopy. The Ru/Co, Ru/Pt, and Ru/Al bilayer nanostructures and their individual constituent metals are studied, with Ru representing an archetypal d-band metal, Co an archetypal ferromagnet, and Pt and Al archetypal heavy and light metals, respectively. The THz conductivity data were analyzed in terms of Drude and Bloch–Grüneisen models, and the interface current coefficient of the internal nanointerface was determined. Strong temperature dependency of the interface current coefficient in the Ru/Co nanostructure is revealed.
Funder
Deutsche Forschungsgemeinschaft Horizon 2020 Framework Programme TopDyn and the Zeiss Foundation HORIZON EUROPE European Innovation Council
Publisher
Walter de Gruyter GmbH
Subject
Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology
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