Evidence for magnetostrictive control of intrinsic susceptibility and coercive force of multidomain magnetite in rocks

Details Evidence for magnetostrictive control of intrinsic susceptibility and coercive force of multidomain magnetite in rocks Evidence for magnetostrictive control of intrinsic susceptibility and coercive force of multidomain magnetite in rocks

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pepi...42..184h&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 42, Issue 3, p. 184-194.

Physics

28

Scientific paper

It is shown that intrinsic susceptibility xi (susceptibility in the absence of self-demagnetizing fields) as well as coercive force HC of multidomain magnetite in rocks are likely to be commonly magnetostrictively controlled-presumably through internal stresses opposing domain wall motion. We use observations of the thermal variation of observed susceptibility x per cm3 of magnetite in the sample and coercive force HC on cooling to ~ 130 K for seven basaltic rocks and for 0.25-0.21 mm magnetite grains dispersed in cement. As expected theoretically with magnetostrictively controlled xi, a plot of 1/x versus λ/JS2 for each sample (where λ is the polycrystalline magnetostriction coefficient and JS is saturation magnetization) gives a reasonably straight line whose 1/x-intercept agrees with N (average self-demagnetizing factor of magnetite grains in the sample) given by HC/JR >= N >= HC/JR - HC/JRi where JR is saturation remanence and Ri is JR when N=0. As expected theoretically with magnetostrictively controlled HC, a plot of HC versus λ/JS for each sample reveals an approximate proportionality. This also implies magnetostrictive control of xi because a plot of 1/x versus HC/JS for each sample yields a straight line of 1/x-intercept agreeing with N from HC/JR  N  HC/JR - HC/JRi as expected if HC and xi are both magnetorestrictively controlled.

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