Enhanced THz emission from spintronic emitters with Pt-Al alloys
Abstract
Platinum (Pt) is the element with the largest spin Hall conductivity and is known as the most efficient spin-to-charge conversion material in spintronic THz emitters. By alloying with aluminum (Al), its resistivity can be substantially increased, exceeding 100 μΩ cm. While the spin Hall conductivity is reduced by alloying, the relative resistivity increase surpasses the reduction of spin Hall conductivity, thereby enhances the spin Hall angle. We make use of this mechanism to improve the commonly used Pt-based spintronic THz emitter and demonstrate that an increase of 67% in the THz emission amplitude can be achieved between 20% and 30% Al in Pt. We show that the enhanced THz emission amplitude is driven by the enhanced multilayer impedance due to the larger resistivity.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (9)
Felix Janus
New Materials Electronics Group, Department of Electrical Engineering and Information Technology, Technical University of Darmstadt 1 , Merckstr. 25, 64283 Darmstadt,
Nicolas S. Beermann
Fakultät für Physik, Universität Bielefeld 2 , Universitätsstraße 25, 33615 Bielefeld,
Amir Khan
Jyoti Yadav
Reshma Rajeev Lekha
New Materials Electronics Group, Department of Electrical Engineering and Information Technology, Technical University of Darmstadt 1 , Merckstr. 25, 64283 Darmstadt,
Wentao Zhang
Hassan A. Hafez
Fakultät für Physik, Universität Bielefeld 1 , 33615 Bielefeld,
Dmitry Turchinovich
Fakultät für Physik, Universität Bielefeld 1 , 33615 Bielefeld,
Markus Meinert
New Materials Electronics Group, Department of Electrical Engineering and Information Technology, Technical University of Darmstadt 1 , Merckstr. 25, 64283 Darmstadt,