Journal Article

Magnetic properties and anisotropy constant of goethite single crystals at saturating high fields

F. Martin-Hernandez and M. M. García-Hernández

in Geophysical Journal International

Volume 181, issue 2, pages 756-761
Published in print May 2010 | ISSN: 0956-540X
Published online May 2010 | e-ISSN: 1365-246X | DOI: https://dx.doi.org/10.1111/j.1365-246X.2010.04566.x
Magnetic properties and anisotropy constant of goethite single crystals at saturating high fields

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Summary

The applied fields in previous studies of goethite's magnetic properties were often not sufficiently high to reach reversible magnetization behaviour of the hard magnetic iron oxide (α-FeOOH). Existing data of its magnetic anisotropy constant are fairly scattered that hampers the further development of more elaborate models of remanence acquisition, magnetic susceptibility behaviour or trends in microcoercivity. Classic rock magnetic properties (magnetization of remanence Mr, saturation magnetization Ms and coercive force Bc) and the first anisotropy constant K on six goethite natural crystals have been determined at room and low temperature using hysteresis up to 9 T. After a detailed analysis of the magnetic properties of the samples, a mean value of K = 90 ± 20 Jm−3 has been evaluated at room temperature and K = 210 ± 40 Jm−3 at 5 K for pure goethite.

Keywords: Magnetic fabrics and anisotropy; Magnetic mineralogy and petrology; Rock and mineral magnetism

Journal Article.  4287 words.  Illustrated.

Subjects: Geophysics

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