Low-field variation of magnetic susceptibility and its effect on the anisotropy of magnetic susceptibility of rocks

Details Low-field variation of magnetic susceptibility and its effect on the anisotropy of magnetic susceptibility of rocks Low-field variation of magnetic susceptibility and its effect on the anisotropy of magnetic susceptibility of rocks

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002geoji.150..715h&link_type=abstract

Geophysical Journal International, Volume 150, Issue 3, pp. 715-723.

Astronomy and Astrophysics

Astronomy

16

Anisotropy, Field Variation, Magnetic Susceptibility

Scientific paper

The theory of the low-field anisotropy of magnetic susceptibility (AMS) assumes a linear relationship between magnetization and the magnetizing field. This assumption is precisely valid in diamagnetic and paramagnetic minerals by definition, while in ferrimagnetic and antiferromagnetic minerals this relationship is in general non-linear (represented by a hysteresis loop), being linear only with very weak fields in which the initial susceptibility is measured. Recently, it has been shown that, in using common measuring fields, the field-independent susceptibility is measured in magnetite, while in pyrrhotite, haematite and titanomagnetite it may often be outside the initial susceptibility range. The problem can be solved in three ways. The simplest way is using very weak measuring fields (less than 10 A m-1), but this can result in significant lowering of sensitivity and precision. The second way is to respect the non-linearity and measure the susceptibility in so many directions that contour diagram of directional susceptibilities can be presented instead of a susceptibility ellipsoid. The third way is to measure the AMS within the Rayleigh law range and calculate the initial directional susceptibilities from which the AMS can be correctly determined using linear theory.

Affiliated with

Also associated with

No associations

Rating

Low-field variation of magnetic susceptibility and its effect on the anisotropy of magnetic susceptibility of rocks does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Low-field variation of magnetic susceptibility and its effect on the anisotropy of magnetic susceptibility of rocks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low-field variation of magnetic susceptibility and its effect on the anisotropy of magnetic susceptibility of rocks will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1047683