Researchers from Swastik Kar’s group at Northeastern University have demonstrated the nanoscale mapping of radio-frequency (RF) fields, which are confined by a permalloy nanowire. They imaged this confinement with high spatial resolution on the Qnami ProteusQ system by mapping the spatial variation of Rabi oscillations of a nitrogen-vacancy (NV). The team observed that ∼100 µm wavelength microwaves could be concentrated into sub-300 nm regions, with up to 16× power enhancement. Micromagnetic simulations confirmed that this modulation arises from the nanowire’s stray-field interference with the incident RF field. These results provide a new pathway for controlling qubits, amplifying RF signals, and mapping local fields in advanced on-chip RF technologies.
Read the full article: Nano Lett. 2025, 25, 23, 9470–9476
