Figure 6.

The resolution of the magnetic surface scan. Three potential scanning magnetometry techniques for Micromagnetic Momography (MMT) have different specifications for spatial resolution and B field sensitivity (a) (with data obtained from Fu et al., ²⁰²⁰; Glenn et al., ²⁰¹⁷; Lima et al., ²⁰¹⁴; Oda et al., ²⁰¹⁶). The theoretically available number of data points per variable that is to be solved by the MMT inversion is governed by the concentration of grains in the sample, the thickness of the sample, and the spatial resolution (i.e., step size) of the magnetic scan (b). The theoretically available number of data points per variable are given for the synthetic sample (3,000 grains/${\mathrm{m}\mathrm{m}}^3$ ‐ 50 μm thick, red line), and different grain concentrations and sample thicknesses for volcanic samples. The typical spatial resolution of the Quantum Diamond Microscope (1.2 μm) is indicated by the gray line.