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An inverse problem of magnetization in geoscience
Intervenant(s) : Sylvain Chevillard (Inria, équipe Apics) 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
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.
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