Journal Article

FZJ-2021-03899

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Generation of terahertz transients from Co 2 Fe 0.4 Mn 0.6 Si -Heusler-alloy/normal-metal nanobilayers excited by femtosecond optical pulses

Heidtfeld, S.FZJ* ; Adam, R. (Corresponding author)FZJ* ; Kubota, T. ; Takanashi, K. ; Cao, D.FZJ* ; Schmitz-Antoniak, C.FZJ* ; Bürgler, D. E.FZJ* ; Wang, F.FZJ* ; Greb, C.FZJ* ; Chen, G. ; Komissarov, I. ; Hardtdegen, H.FZJ* ; Mikulics, M.FZJ* ; Sobolewski, R. ; Suga, S. ; Schneider, C. M.FZJ*

2021
APS College Park, MD

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Please use a persistent id in citations: http://hdl.handle.net/2128/28802  doi:10.1103/PhysRevResearch.3.043025

Abstract: We generated pulses of electromagnetic radiation in the terahertz (THz) frequency range by optical excitation of Co2Fe0.4Mn0.6Si (CFMS)/normal-metal (NM) bilayer structures. The CFMS is a Heusler alloy showing a band gap in one spin channel and is therefore a half metal. We compared the THz emission efficiency in a systematic manner for four different CFMS/NM bilayers, where NM was either Pt, Ta, Cr, or Al. Our measurements show that the THz intensity is highest for a Pt capping. We also demonstrate the tunability of the THz amplitude by varying the magnetic field for all four bilayers. We attribute the THz generation to the inverse spin Hall effect. In order to investigate the role of the interface in THz generation, we measured the spin mixing conductance for each CFMS/NM bilayer using a ferromagnetic resonance method. We found that the spin-orbit coupling cannot completely describe the THz generation in the bilayers and that the spin transmission efficiency of the CFMS/NM interface and the spin diffusion length, as well as the oxidation of the NM layer, play crucial roles in the THz emission process.

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Contributing Institute(s):

1. Elektronische Eigenschaften (PGI-6)
2. Materialwissenschaft u. Werkstofftechnik (ER-C-2)

Research Program(s):

1. 5214 - Quantum State Preparation and Control (POF4-521) (POF4-521)

Appears in the scientific report 2021

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Database coverage:
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