Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmgp51a0982g&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #GP51A-0982
Physics
1519 Magnetic Mineralogy And Petrology, 1540 Rock And Mineral Magnetism, 3924 High-Pressure Behavior, 5109 Magnetic And Electrical Properties
Scientific paper
We report a novel system designed to measure reversible magnetic susceptibility of micron-sized samples under high pressures (in excess of 30 GPa) in a diamond anvil cell. We find that magnetite reversible hysteresis parameters vary <15% below 0.6 to 1.0 GPa, while at higher pressures significant increases occur in (1) bulk coercivity (Hc) and (2) the ratio of saturation remanent magnetization (Mrs) to saturation magnetization (Ms). The net effect of pressure is to displace magnetite toward a truer single domain state with both higher Mrs/Ms and Hc. Our data, together with the fact that the Curie temperature increases with pressure, suggest that magnetite can account for geomagnetic anomalies related to some subduction zones and potentially to meteorite impact sites on Earth, as well as magnetic signatures observed on some planetary bodies like Mars.
Chervin J.
Gilder Stuart
Legoff Marc
Peyronneau Jean
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