Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010geoji.181..756m&link_type=abstract
Geophysical Journal International, Volume 181, Issue 2, pp. 756-761.
Astronomy and Astrophysics
Astronomy
Magnetic Fabrics And Anisotropy, Magnetic Mineralogy And Petrology, Rock And Mineral Magnetism
Scientific paper
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.
Garcia-Hernandez M. M.
Martín-Hernández Fátima
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