Anisotropy Constant Within the Basal Plane of Hematite Single Crystals: High Field Experiments
Abstract
Hematite is one of the most important magnetic carriers of remanent magnetization in natural samples. However, its strong anisotropy makes difficult to determine one single value for the magnetic anisotropy constant and other magnetic properties. In particular, the anisotropy of hematite within the basal plane is controversial because a triaxial anisotropy compatible with the crystallographic structure has not always been detected. We have carried out a comparative analysis of rock magnetic properties, compositional analysis and determination of the magnetic anisotropy constant assuming different models in order to understand the factors that control the presence or absence of a triaxial anisotropy. The anisotropy constant within the basal plane range between 13-0 [Jm-3]. Samples where the triaxial anisotropy constant is not observed correspond to those where the relationship between saturation magnetization (Ms) and coercivity (Bc) is linear while samples with significant triaxial anisotropies have a power low between Ms and Bc.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2010
- Bibcode:
- 2010AGUFMGP41A1026M
- Keywords:
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- 1518 GEOMAGNETISM AND PALEOMAGNETISM / Magnetic fabrics and anisotropy;
- 1519 GEOMAGNETISM AND PALEOMAGNETISM / Magnetic mineralogy and petrology;
- 1540 GEOMAGNETISM AND PALEOMAGNETISM / Rock and mineral magnetism