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Novel high pressure magnetic measurements with application to magnetite
Author(s) -
Gilder Stuart A.,
LeGoff Maxime,
Peyronneau Jean,
Chervin JeanClaude
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2001gl014227
Subject(s) - magnetite , remanence , coercivity , saturation (graph theory) , geology , earth's magnetic field , meteorite , rock magnetism , materials science , mars exploration program , mineralogy , magnetization , geophysics , condensed matter physics , astrobiology , magnetic field , physics , paleontology , mathematics , quantum mechanics , combinatorics
We report a novel system designed to measure reversible magnetic susceptibility of micron‐sized samples under high pressures 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 magnetite 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.