Fig. 2: Micromagnetics simulations of an oscillating DW pinned at a notch in a semicircular Py nanowire.

a Simulated FFT amplitude showing the frequency of DW oscillations over applied fields in a 300 nm wide nanowire shaped into a semicircle (radius 2.5 μm) with a centrally positioned 120 nm radius half-circle defect. The dashed red lines show the calculated frequency of the NV ground state transition for a field perfectly aligned along the NV axis. The schematic at the bottom of the panel depicts the nanowire and magnetic field configuration. b Spatially resolved image of the FFT amplitude of the mode in a at 1 mT. c Spatially resolved image of the FFT amplitude of a higher frequency mode at 1 mT, showing that more uniform dynamics occur at much higher frequencies than DW dynamics.