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Detailed Reference Information |
Hirt, A.M., Lanci, L., Dobson, J., Weidler, P. and Gehring, A.U. (2002). Low-temperature magnetic properties of lepidocrocite. Journal of Geophysical Research 107: doi: 10.1029/2001JB000242. issn: 0148-0227. |
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The magnetic properties of synthetic lepidocrocite (γ-FeOOH) were investigated between 5 and 300 K. The purity of the samples was verified by X-ray diffraction and M¿ssbauer spectra at room temperature. The lepidocrocite is paramagnetic at room temperature with a low field susceptibility of 57.8 ¿ 10-8 m3 kg-1. It undergoes magnetic ordering at low temperature and a peak in in-phase susceptibility occurs around 52 K, where it is antiferromagnetic. Thermal demagnetization of low-temperature remanence after cooling in zero field and in a 2.5-T field display a large loss in remanence from 5 to 30 K. Hysteresis loops are open and symmetric about the origin below 50 K; the remanent magnetization probably arises from a defect magnetic moment. The field-cooled hysteresis loop at 5 K is shifted along the field axis, which implies an exchange bias between antiferromagnetic and ferrimagnetic alignment in the lepidocrocite. |
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Abstract |
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Keywords
Geomagnetism and Paleomagnetism, Magnetic mineralogy and petrology, Geomagnetism and Paleomagnetism, Rock and mineral magnetism, Mineral Physics |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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