Static stress demagnetization of single and multidomain magnetite with implications for meteorite impacts - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue High Pressure Research Année : 2006

Static stress demagnetization of single and multidomain magnetite with implications for meteorite impacts

Résumé

Stress demagnetization effects on ferromagnetic minerals are poorly known, especially above 1 GPa, and when initially magnetized under pressure and then subjected to further stress. Our experiments on pure magnetite under quasi-hydrostatic loads in the presence of a small (Earth's) field show that stress demagnetization depends on domain state and stress history. Viewed globally, the results follow a simple law where the percentage loss in magnetic moment is the inverse of pressure (e.g., 50% loss in moment at 1 GPa, 67% loss at 2 GPa, etc.). Our experiments also quantify the effect of demagnetization upon stress release, where the moment upon full decompression is two-thirds less than the moment when decompression first began. Given the magnitude of the stress demagnetization effect, we conclude that the presence or absence of a planetary magnetic field cannot be deduced from the magnetic fields measured over meteorite craters, such as those on Mars.
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Dates et versions

hal-00128735 , version 1 (02-02-2007)

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Citer

Stuart A. Gilder, Maxime Le Goff, Jean-Claude Chervin. Static stress demagnetization of single and multidomain magnetite with implications for meteorite impacts. High Pressure Research, 2006, 26, pp.539-547. ⟨10.1080/08957950601092085⟩. ⟨hal-00128735⟩
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