Anisotropy of magnetic susceptibility in a weak magnetic field induced by stress

Details Anisotropy of magnetic susceptibility in a weak magnetic field induced by stress Anisotropy of magnetic susceptibility in a weak magnetic field induced by stress

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pepi...51..349k&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 51, Issue 4, p. 349-354.

Physics

5

Scientific paper

Changes in the anisotropy of magnetic susceptibility of basalts and magnetite in a weak magnetic field under uniaxial pressures of up to 60 MPa are investigated experimentally. As a result of the changes in the anisotropy of intrinsic susceptibility of ferrimagnetic minerals, all the parameters of rock anisotropy change considerably under elastic deformation. The orientation of the susceptibility ellipsoid of rocks with a relatively low degree of anisotropy (a few per cent) in their initial underformed state is fully determined by the direction of the acting pressure already at stresses of ~ 50 MPa. The total anisotropy in rocks with a higher shape anisotropy under directional pressure is determined by the superposition of the shape and stress effects. Qualitatively, the changes in the degree of anisotropy depend on the mutual orientation of the initial susceptibility ellipsoid and the stress. The observed pressure changes of the anisotropy agree with the model of the reversible rotation of spontaneous magnetization within the separate domains of the ferrimagnetic mineral. A moderate and systematic decrease in the mean susceptibility of the investigated basaltic rocks occurs with increasing elastic deformation.

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