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20 August 2020 Correlation of interface transmission in THz spintronic emitters with spin mixing conductance in spin pumping experiments
Laura Scheuer, Moritz Ruhwedel, Garik Torosyan, René Beigang, Georg Schmidt, Evangelos Th. Papaioannou
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Proceedings Volume 11470, Spintronics XIII; 1147024 (2020) https://doi.org/10.1117/12.2569968
Event: SPIE Nanoscience + Engineering, 2020, Online Only
Abstract
The field of THz spintronics is a novel direction in the research field of spintronics that combines magnetism with optical physics and ultrafast photonics. The experimental scheme of the field involves the use of femtosecond laser pulses to trigger ultrafast spin and charge dynamics in bilayers composed of ferromagnetic (FM) and nonmagnetic (NM) thin films where the NM layer features a strong spin-orbit coupling. The key technological and scientific challenges of THz spintronic emitters is to increase their intensity and frequency bandwidth. To achieve this the control of the source of the radiation, namely the transport of the ultrafast spin current is required. However, the transfer of a spin current from a FM to a NM layer is a highly interface-sensitive effect. In this work we study the properties of the spin current transport through the interface measuring the strength of the THz emission and compare it to the effective spin mixing conductance, one of the key concepts in the spin current transport through interfaces. The results show an enhancement of the spin mixing conductance for interfaces with higher degree of epitaxy similarly to the improvement of the THz emission. The proportionality between spin mixing conductance and THz emission can define new directions in engineering the emission of spintronic THz emitters.
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Laura Scheuer, Moritz Ruhwedel, Garik Torosyan, René Beigang, Georg Schmidt, and Evangelos Th. Papaioannou "Correlation of interface transmission in THz spintronic emitters with spin mixing conductance in spin pumping experiments", Proc. SPIE 11470, Spintronics XIII, 1147024 (20 August 2020); https://doi.org/10.1117/12.2569968
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KEYWORDS
Terahertz radiation
Interfaces
Iron
Platinum
Spintronics
Ultrafast phenomena
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