Figure 2: Stray-field imaging of a square of Fe20Ni80.
From: Stray-field imaging of magnetic vortices with a single diamond spin
(a,b) Dual-iso-B images recorded with a probe-to-sample distance d=400 nm in a and d=300 nm in b. The red squares depict the 5-μm magnetic structure. In a, the NV is oriented mainly along the y axis (θ=85°, φ=85°), and in b, the NV defect has a strong component along the z axis (θ=37°, φ=135°). Images correspond to 200 × 200 pixels, with a 30-nm pixel size and a 60-ms acquisition time per pixel. (c,d) Simulated magnetic field maps corresponding to a and b, respectively.
