Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 56: Bulk Materials: Soft and hard permanent magnets
MA 56.11: Vortrag
Donnerstag, 23. März 2017, 17:45–18:00, HSZ 403
Neutron depolarization imaging of magnetite in chiton teeth — •Marc Seifert1,2, Michael Schulz1,2, Georg Benka2, Christian Pfleiderer2, and Stuart Gilder3 — 1Heinz Maier-Leibnitz Zentrum (MLZ), Technical University of Munich, D-85748 Garching, Germany — 2Physics Department, Technical University of Munich, D-85748 Garching, Germany — 3Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universität München, D-80539 Munich, Germany
Magnetite constitutes one of the most abundant magnetic minerals in the Earth’s crust. In the single domain state, magnetite often carries the magnetic remanence in rocks due to its stable and strong magnetic remanence. Hence it is of keen interest to paleomagnetists who study the ancient magnetic field preserved in the rock record. The extremely small size range and vulnerability to oxidation of single domain magnetite makes synthetization and preservation virtually impossible. Consequently, most experimental work on magnetite under pressure is carried out on multidomain magnetite. The radula of the marine mollusc chiton (Polyplacophora) is one of the few natural sources of single domain magnetite. We have performed a comparative study on samples of chiton radula in a vibrating sample magnetometer (VSM) and with the newly evolving neutron depolarization imaging (NDI) technique. Despite a constant offset between the VSM and NDI data in the coercivity we find a good agreement between the two techniques.