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10 - Magnetic Properties of Rocks

Published online by Cambridge University Press:  19 November 2021

Nikolai Bagdassarov
Nikolai Bagdassarov
Affiliation:
Goethe-Universität Frankfurt Am Main
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Summary

Dia, para- and ferromagnetism of rocks and minerals correspond to the wide range of magnetic susceptibility. Atomistic models of dia- and paramagnetism are considered. The Langevin function describes magnetic saturation of paramagnetic particles, whose magnetic susceptibility depends on temperature according to the Curie–Weiß law. Ferromagnetism, antiferromagnetism, ferrimagnetism and canted antiferromagnetism are considered. Ferromagnetic minerals are characterized by magnetic domains whose boundaries experience Barkhausen jumps during magnetization-demagnetization. Magnetic domains are separated by Bloch walls. Koenigsberg’s ratio, i.e. the ratio of induced and remanent magnetizations, depends on the shape demagnetization factor a The concept of locking temperature based on the magnetization relaxation time is used to reconstruct paleomagnetic fields, i.e. in the case of magnetic stripes of mid-oceanic ridge basalts. Principles of chemical, pressure and detrital-remanent magnetization. Focus Box 10.1: Magnetic field of a small dipole. Focus Box 10.2: Brillouin function. Focus Box 10.3: Electron shells, orbitals and orbital hybridization. Focus Box 10.4: Extended Weiss model.

Keywords

Magnetic characteristics and unitsdia-para- and ferromagnetismmagnetic domainsmagnetic mineralsrock magnetismmagnetic susceptibility and temperatureinduced and remanent magnetizationfundamentals of chemicalpressureand detrital-remanent magnetization.
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Fundamentals of Rock Physics , pp. 414 - 454
Publisher: Cambridge University Press
Print publication year: 2021

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References

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