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Talks : | When rocks are heated (typically when they are formed, or after
| subsequent alteration), they can become magnetized by the ambient
| magnetic field. This remanent magnetization is used to study
| important processes in Earth sciences, since it provides records of
| past variations of the geodynamo. It has been used, e.g., to study
| motion of tectonic plates and geomagnetic reversals. SQUID
| microscopes are sensitive instruments, able to measure the magnetic
| field produced by the remanent magnetization of thin slabs of rocks.
| More precisely, it can measure the normal component of the magnetic
| field on a plane slightly above the sample, with a good spatial
| resolution. We will present on-going research on the inverse problem
| consisting in recovering the magnetization distribution of the
| sample, from the measures given by a SQUID microscope.