A linear field dependence of thermoremanence in low magnetic fields

Details A linear field dependence of thermoremanence in low magnetic fields A linear field dependence of thermoremanence in low magnetic fields

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pepi..162..244y&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 162, Issue 3-4, p. 244-248.

Physics

6

Scientific paper

We tested a linear field-dependence of thermoremanent magnetization (TRM) to saturation isothermal remanent magnetization (SIRM) ratio for magnetite-containing natural samples. The TRM/SIRM shows a linear field-dependence to very low field ranges (<1 μT). This observation is at odds with a claim of limited sensitivity at low fields in TRM acquisition documented in previous studies. We attribute the difference to poor field control in the ovens used in previous studies. The TRM/SIRM ratio shows a grain-size dependence. For magnetite-containing samples with insignificant anisotropy, the TRM/SIRM is most efficient in pseudo-single-domain magnetites. These results suggest that while the TRM/SIRM ratio is linear at low field strengths, the ratio provides only a crude estimation on the actual paleo-field within two orders of magnitude, suggesting that a careful sample characterization is necessary in applying the TRM/SIRM as a paleointensity proxy.

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