Figure 3: Experiment results of vector MW magnetometry.
From: High-resolution vector microwave magnetometry based on solid-state spins in diamond
(a) Definition of the vector and angle. (b) Schematic view of the MW magnetic field distribution and the scanning line. In the near field, the oscillation current in the copper wire generates a linearly polarized magnetic field with a direction perpendicular to the copper wire and along the tangent. The coordinate is set as follows: x is along the copper wire, y is perpendicular to the copper wire and parallel to the diamond surface, and z is vertical to the diamond surface. The scanning line (black line) is made below the copper wire and along the y axis. (c) Measured Bmwp with the magnetic field along [111] (triangle), [–111] (diamond), [1–11] (rhombic) and [–1–11] (hexagon). The fitting curve to the data (dashed line) gives the distance r0=47.49 μm. (d) θ (diamond) and ϕ (circle) calculated from the data in c. The dashed line is the fitting curve to the data. The fitting yields the angular resolution of δθ=5.7 mrad and δϕ=9.9 mrad.
