Koyel Banerjee-Ghosh, Oren Ben Dor, et al.
Science
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.
Koyel Banerjee-Ghosh, Oren Ben Dor, et al.
Science
Manfred Albrecht, Srikanth Ganesan, et al.
IEEE Transactions on Magnetics
Amir Capua, See-Hun Yang, et al.
Physical Review B - CMMP
Hyunsoo Yang, See-Hun Yang, et al.
INTERMAG 2005