Ferromagnetic dynamics detected via one- and two-magnon NV relaxometry

@article{McCullian2019FerromagneticDD,
  title={Ferromagnetic dynamics detected via one- and two-magnon NV relaxometry},
  author={Brendan A McCullian and Ahmed M. Thabt and Benjamin A. Gray and Alex L. Melendez and M Wolf and Vladimir L. Safonov and Denis V. Pelekhov and Vidya Praveen Bhallamudi and Michael R. Page and P. Chris Hammel},
  journal={arXiv: Mesoscale and Nanoscale Physics},
  year={2019}
}
The NV center in diamond has proven to be a powerful tool for locally characterizing the magnetic response of microwave excited ferromagnets. To date, this has been limited by the requirement that the FMR excitation frequency be less than the NV spin resonance frequency. Here we report NV relaxometry based on a two-magnon Raman-like process, enabling detection of FMR at frequencies higher than the NV frequency. For high microwave drive powers, we observe an unexpected field-shift of the NV… 

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