Year: 2025
Type: article
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.
Source: Applied Physics Letters
DOI: 10.1063/5.0294491
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Awards: Extreme Optical Nonlinearities in 2D materials for Far-Infrared Photonics, G186843352, Magnetron CoSputtering System, G2924164741, G3802872888, G434337789, Untersuchung von NichtgleichgewichtsSpinLadungsTransportmechanismen für Hochleistungs und antennengekoppelte spintronische TerahertzBauelemente (HIGHSPINTERA), G6327420348, Integrierte GraphenaufChip Terahertz Technologie (INTEGRATECH), Variables HallMesssystem, Spintronische THzEmitter mit uniaxialer und unidirektionaler magnetischer Anisotropie für magnetfeldfreien Betrieb und elektrische THzPhasenUmschaltung
OpenAlex ID: W4415152722