Filtering and imaging of frequency-degenerate spin waves using nanopositioning of a single-spin sensor
arXiv:2207.02798 · doi:10.1021/acs.nanolett.2c02791
Abstract
Nitrogen-vacancy (NV) magnetometry is a new technique for imaging spin waves in magnetic materials. It detects spin waves by their microwave magnetic stray fields, which decay evanescently on the scale of the spin-wavelength. Here, we use nanoscale control of a single-NV sensor as a wavelength filter to characterize frequency-degenerate spin waves excited by a microstrip in a thin-film magnetic insulator. With the NV-probe in contact with the magnet, we observe an incoherent mixture of thermal and microwave-driven spin waves. By retracting the tip, we progressively suppress the small-wavelength modes until a single coherent mode emerges from the mixture. In-contact scans at low drive power surprisingly show occupation of the entire iso-frequency contour of the two-dimensional spin-wave dispersion despite our one-dimensional microstrip geometry. Our distance-tunable filter sheds light on the spin-wave band occupation under microwave excitation and opens opportunities for imaging magnon condensates and other coherent spin-wave modes.
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- Flux channeling induced nano-confinement and enhancement of microwaves imaged by Rabi oscillation mapping
- Isofrequency spin-wave imaging using color center magnetometry for magnon spintronics
- Quantum sensing magnonic number states using a bosonic mode as the probe