Generation of terahertz transients from Co2Fe0.4 M0.6 Si-Heusler-alloy/normal-metal nanobilayers excited by femtosecond optical pulses

Sarah Heidtfeld, Roman Adam, Takahide Kubota, Koki Takanashi, Derang Cao, Carolin Schmitz-Antoniak, Daniel E. Bürgler, Fangzhou Wang, Christian Greb, Genyu Chen, Ivan Komissarov, Hilde Hardtdegen, Martin Mikulics, Roman Sobolewski, Shigemasa Suga, Claus M. Schneider

Research output: Contribution to journalArticlepeer-review

Abstract

We generated pulses of electromagnetic radiation in the terahertz (THz) frequency range by optical excitation of (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.

Original languageEnglish
Article number043025
JournalPhysical Review Research
Volume3
Issue number4
DOIs
Publication statusPublished - 2021 Dec

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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