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

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 develo...

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Veröffentlicht in:	Geophysical journal international 2010-05, Vol.181 (2), p.756-761
Hauptverfasser:	Martin-Hernandez, F., García-Hernández, M. M.
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Sprache:	eng
Schlagworte:	Magnetic fabrics and anisotropy Magnetic mineralogy and petrology Rock and mineral magnetism
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container_title	Geophysical journal international
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creator	Martin-Hernandez, F. García-Hernández, M. M.
description	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.
doi_str_mv	10.1111/j.1365-246X.2010.04566.x
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subjects	Magnetic fabrics and anisotropy Magnetic mineralogy and petrology Rock and mineral magnetism
title	Magnetic properties and anisotropy constant of goethite single crystals at saturating high fields
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