Ensemble-averaged Rabi oscillations in a ferromagnetic CoFeB film

Amir Capua (), Charles Rettner, See-Hun Yang, Timothy Phung and Stuart S. P. Parkin ()
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Amir Capua: Almaden Research Center
Charles Rettner: Almaden Research Center
See-Hun Yang: Almaden Research Center
Timothy Phung: Almaden Research Center
Stuart S. P. Parkin: Almaden Research Center

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: 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.

Date: 2017
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DOI: 10.1038/ncomms16004

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