Optical conversion of pure spin currents in hybrid molecular devices

May C. Wheeler, Fatma Al Ma'Mari, Matthew Rogers, Francisco J. Gonçalves, Timothy Moorsom, Arne Brataas, Robert Stamps, Mannan Ali, Gavin Burnell, B. J. Hickey, Oscar Cespedes

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Carbon-based molecules offer unparalleled potential for THz and optical devices controlled by pure spin currents: a low-dissipation flow of electronic spins with no net charge displacement. However, the research so far has been focused on the electrical conversion of the spin imbalance, where molecular materials are used to mimic their crystalline counterparts. Here, we use spin currents to access the molecular dynamics and optical properties of a fullerene layer. The spin mixing conductance across Py/C60 interfaces is increased by 10% (5 × 1018 m-2) under optical irradiation. Measurements show up to a 30% higher light absorbance and a factor of 2 larger photoemission during spin pumping. We also observe a 0.15 THz slowdown and a narrowing of the vibrational peaks. The effects are attributed to changes in the non-radiative damping and energy transfer. This opens new research paths in hybrid magneto-molecular optoelectronics, and the optical detection of spin physics in these materials.

Original languageEnglish
Article number926
JournalNature Communications
Volume8
Issue number1
DOIs
Publication statusPublished - Dec 1 2017

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Wheeler, M. C., Ma'Mari, F. A., Rogers, M., Gonçalves, F. J., Moorsom, T., Brataas, A., Stamps, R., Ali, M., Burnell, G., Hickey, B. J., & Cespedes, O. (2017). Optical conversion of pure spin currents in hybrid molecular devices. Nature Communications, 8(1), [926]. https://doi.org/10.1038/s41467-017-01034-0