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We demonstrate optical detection of a broad spectrum of ferromagneticexcitations using nitrogen-vacancy (NV) centers in an ensemble of nanodiamonds.Our recently developed approach exploits a straightforward CW detection schemeusing readily available diamond detectors, making it easily implementable. TheNV center is a local detector, giving the technique spatial resolution, whichhere is defined by our laser spot, but in principle can be extended far intothe nanoscale. Among the excitations we observe are propagating dipolar anddipolar-exchange spinwaves, as well as dynamics associated with themulti-domain state of the ferromagnet at low fields. These results offer anapproach, distinct from commonly used ODMR techniques, for spatially resolvedspectroscopic study of magnetization dynamics at the nanoscale.

Spatially resolved detection of complex ferromagnetic dynamics using optically detected NV spins