Magnetic properties of single and multi‐domain magnetite under pressures from 0 to 6 GPa

Gilder, Stuart; LeGoff, Maxime; Chervin, J. C.; Peyronneau, J.

doi:10.1029/2004gl019844

Cited by 50 publications

(49 citation statements)

References 14 publications

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“…Similar irreversible changes in magnetic properties have been observed in magnetite under hydrostatic pressures up to 6 GPa [18] and in hematite powder subjected to shocks between 8-27 GPa [12]. We have several hypotheses which could explain these changes in pyrrhotite.…”

Section: Discussionsupporting

confidence: 73%

“…The break up of large, low-coercivity, pseudosingle domain and multidomain grains into many smaller single domain grains [18] should result in an increase in the bulk coercivity and saturation magnetization [14], which is consistent with changes in MDF and SIRM. However, we would also expect to see an increasing trend in the M rs /M s with pressure [15], which is not supported by our results.…”

Section: Discussionsupporting

confidence: 59%

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Shock Demagnetization of Pyrrhotite (Fe1−xS, x≤0.13) and Implications for the Martian Crust and Meteorites

Louzada¹,

Stewart²,

Weiss³

2006

AIP Conference Proceedings

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After cessation of the dynamo on Mars, giant impact events should have demagnetized large regions of the crust. Models of the decay of shock pressure with distance indicate that the demagnetized zones are bound by peak shock pressures between 1 and 3 GPa. We performed the first planar shock recovery experiments at these pressures on natural pyrrhotite, a magnetic mineral found in Martian meteorites. Post-shock magnetic measurements show that pyrrhotite demagnetizes significantly (~85-90%) when subject to shock pressures between 1 and 4 GPa. Permanent changes to the magnetic properties of recovered samples include an increase in the saturation remanence and the mean destructive field, indicating that shocks harden the coercivity. We conclude that pyrrhotite is a candidate carrier for the magnetization in the Martian crust and that pyrrhotite in meteorites shocked to modest pressures may retain a pre-shock remanence.

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Section: Discussionsupporting

confidence: 73%

Section: Discussionsupporting

confidence: 59%

Shock Demagnetization of Pyrrhotite (Fe1−xS, x≤0.13) and Implications for the Martian Crust and Meteorites

Louzada¹,

Stewart²,

Weiss³

2006

AIP Conference Proceedings

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“…Of the quantities shown in equation (7), m and r are known or are easily determined from a manufacturer's data sheet for magnetic nanoparticles. The magnetic moment can be found from the results of another study [9]. In this study, particles were subjected to different pressures and varying levels of magnetic fields, both direct and varying.…”

Section: Proposed Methodsmentioning

confidence: 99%

Magnetic Nanoparticle-Based Gyroscopic Sensor: A Review

Krug

Asumadu

2015

IEEE Sensors J.

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A gyroscopic orientation sensor is proposed using magnetic nanoparticles and electric current. Nanoparticles are spun in alternating magnetic fields. External forces imposed on the changing gyroscopic orientation of the nanoparticles cause a change in the strength of the magnetic field. The sensory effect of the magnetic strength is predicted using theoretical models for fluid friction, susceptibility, and local nanoparticle interactions. Fluid inertia and coupling between particles are negligible compared with the imposed field and are neglected to simplify the model. The configuration leads to an orientation sensor for detecting the change in orientation of nanoparticles in an alternating magnetic field.

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“…Experiments by McEnroe et al (2004) suggest that the lamellae may be stable at lower crustal temperatures and pressures. Increasing pressures also have an effect on the magnetic properties of single and multi-domain magnetite (Gilder et al 2004) and titanomagnetite (Gilder and Le Goff 2008). Both saturation remanent magnetization and coercivity increase markedly in titanomagnetites at typical lower crustal pressures.…”

Section: Interpretation Of Lower Crustal Processesmentioning

confidence: 95%

Mapping and Interpretation of the Lithospheric Magnetic Field

Purucker

Clark

2010

Geomagnetic Observations and Models

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We review some of the controversial and exciting interpretations of the magnetic field of the earth's lithosphere occurring in the four year period ending with the IAGA meeting in Sopron in 2009. This period corresponds to the end of the Decade of Geopotential Research, an international effort to promote and coordinate a continuous monitoring of geopotential field variability in the near-Earth environment. One of the products of this effort has been the World Digital Magnetic Anomaly Map, the first edition of which was released in 2007. A second, improved, edition is planned for 2011. Interpretations of the lithospheric magnetic field that bear on impacts, tectonics, resource exploration, and lower crustal processes are reviewed. Future interpretations of the lithospheric field will be enhanced through a better understanding of the processes that create, destroy, and alter magnetic minerals, and via routine measurements of the magnetic field gradient. IntroductionThe magnetic field originating in the earth's lithosphere is part of the earth's magnetic field complex, a dynamic system (Friis-Christensen et al. 2009) dominated by the interaction of the earth's magnetic field dynamo with that of the sun's. The lithospheric field M.E. Purucker ( ) Raytheon at Planetary Geodynamics Lab, Goddard Space Flight Center, Code 698, Greenbelt, MD 20771, USA e-mail: michael.e.purucker@nasa.gov is dominated by static (on a human time scale) contributions that typically represents less than 1% of the overall magnitude of the magnetic field complex, and originate from rocks in the crust and locally, the uppermost mantle. Interpretation of the lithospheric magnetic field is used in (1) structural geology and geologic mapping, and extrapolation of surface observations of composition and structure, (2) resource exploration and 3) plate tectonic reconstructions and geodynamics.This article is designed as a review describing recent progress in mapping and interpreting the lithospheric magnetic field, and also includes some highlights from the 2009 IAGA meeting in Sopron, Hungary. Since IAGA meets every four years, we have designed this review to highlight progress in the four year period from 2005 through 2009, although references to earlier important works are not neglected, especially in the area of resource exploration. Several reviews bearing on the mapping and interpretation of the lithospheric magnetic field have appeared between 2005 and 2009. Review articles within books and encyclopedias have included those within the Encyclopedia of Geomagnetism and Paleomagnetism (Gubbins and

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Magnetic properties of single and multi‐domain magnetite under pressures from 0 to 6 GPa

Cited by 50 publications

References 14 publications

Shock Demagnetization of Pyrrhotite (Fe1−xS, x≤0.13) and Implications for the Martian Crust and Meteorites

Shock Demagnetization of Pyrrhotite (Fe1−xS, x≤0.13) and Implications for the Martian Crust and Meteorites

Magnetic Nanoparticle-Based Gyroscopic Sensor: A Review

Mapping and Interpretation of the Lithospheric Magnetic Field

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