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Spin injection from a ferromagnetic metal into an organic semiconductor

Integrated MSc, Physics · NISER Bhubaneswar · Completed · 2021

The short version

Investigated how a pure spin current generated by microwave excitation of a magnetic oxide can be injected into an organic semiconductor and detected electrically. Built a custom microwave measurement setup from scratch alongside the thin-film growth and magnetic characterisation it needed. The thesis received the top grade, and the measurement setup went on to feed a co-authored 2024 publication.

No PDF is available for this thesis yet.

Integrated MSc (B.Sc. + M.Sc.) thesis, Physics major with a Computer Science minor, NISER Bhubaneswar, 2016 to 2021. Awarded the top grade.

What the project did

The project studied spin injection from a ferromagnetic metal into an organic semiconductor. A pure spin current was generated by radio-frequency excitation of a La0.67Sr0.33MnO3 (LSMO) thin film and detected, after injection into the organic semiconductor C60, via the inverse spin Hall effect.

Setup and techniques

  • Built a vector-network-analyser-based ferromagnetic resonance (FMR) setup, measuring S11/S21 reflection and transmission parameters up to 26 GHz.
  • Grew the LSMO ferromagnetic layer by pulsed laser deposition.
  • Deposited the C60 organic semiconductor by thermal evaporation.
  • Characterised the films with SQUID magnetometry and X-ray reflectivity (XRR).

Outcome

The FMR setup and the LSMO/Pt measurement approach built for this thesis fed directly into a co-authored 2024 publication, Tailoring spin-to-charge conversion efficiency via microwave frequency in a La0.67Sr0.33MnO3/Pt bilayer system, in SPIN.