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Ensemble-averaged Rabi oscillations in a ferromagnetic CoFeB film

Author

Listed:
  • Amir Capua

    (Almaden Research Center
    Max Planck Institute for Microstructure Physics
    The Hebrew University of Jerusalem, The Edmond J. Safra Campus—Givat Ram)

  • Charles Rettner

    (Almaden Research Center)

  • See-Hun Yang

    (Almaden Research Center)

  • Timothy Phung

    (Almaden Research Center)

  • Stuart S. P. Parkin

    (Almaden Research Center
    Max Planck Institute for Microstructure Physics)

Abstract

Rabi oscillations describe the process whereby electromagnetic radiation interacts coherently with spin states in a non-equilibrium interaction. To date, Rabi oscillations have not been studied in one of the most common spin ensembles in nature: spins in ferromagnets. Here, using a combination of femtosecond laser pulses and microwave excitations, we report the classical analogue of Rabi oscillations in ensemble-averaged spins of a ferromagnet. The microwave stimuli are shown to extend the coherence-time resulting in resonant spin amplification. The results we present in a dense magnetic system are qualitatively similar to those reported previously in semiconductors which have five orders of magnitude fewer spins and which require resonant optical excitations to spin-polarize the ensemble. Our study is a step towards connecting concepts used in quantum processing with spin-transport effects in ferromagnets. For example, coherent control may become possible without the complications of driving an electromagnetic field but rather by using spin-polarized currents.

Suggested Citation

  • Amir Capua & Charles Rettner & See-Hun Yang & Timothy Phung & Stuart S. P. Parkin, 2017. "Ensemble-averaged Rabi oscillations in a ferromagnetic CoFeB film," Nature Communications, Nature, vol. 8(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms16004
    DOI: 10.1038/ncomms16004
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