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Nitrogen-vacancy (NV) magnetometry is a new technique for imaging spin wavesin magnetic materials. It detects spin waves by their microwave magnetic strayfields, which decay evanescently on the scale of the spin-wavelength. Here, weuse nanoscale control of a single-NV sensor as a wavelength filter tocharacterize frequency-degenerate spin waves excited by a microstrip in athin-film magnetic insulator. With the NV-probe in contact with the magnet, weobserve an incoherent mixture of thermal and microwave-driven spin waves. Byretracting the tip, we progressively suppress the small-wavelength modes untila single coherent mode emerges from the mixture. In-contact scans at low drivepower surprisingly show occupation of the entire iso-frequency contour of thetwo-dimensional spin-wave dispersion despite our one-dimensional microstripgeometry. Our distance-tunable filter sheds light on the spin-wave bandoccupation under microwave excitation and opens opportunities for imagingmagnon condensates and other coherent spin-wave modes.

Filtering and imaging of frequency-degenerate spin waves using nanopositioning of a single-spin sensor