QDM magnetic microscopy dataset of a speleothem from Morocco

The dataset was measured on a Quantum Diamond Microscope (QDM) at Harvard University, using a stalagmite from Wintimdouine cave (Morroco). <br> We performed a magnetic map over a sample section of approximately 1410 μm × 2256 μm with a grid spacing of 2.35 μm and a sensor-sample distance of approximately 5 μm, totaling 576,000 data points. The data were taken in projected magnetic microscopy (PMM) mode and converted to the vertical component of magnetic field (𝑏𝑧). <br> In this sample, the magnetic remanence is carried by magnetite and hematite. We apply two IRM pulse fields parallel to the sample surface, 2.7 T and 0.3 T, respectively, toward the +Y and -Y directions. The high coercivity grains (hematite) would point towards +Y and the low coercivity ones (magnetite) would align in the -Y direction.