Field-dependence of AC susceptibility in titanomagnetites

Details Field-dependence of AC susceptibility in titanomagnetites Field-dependence of AC susceptibility in titanomagnetites

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998e%26psl.157..129j&link_type=abstract

Earth and Planetary Science Letters, vol. 157, Issue 3-4, pp.129-139

Computer Science

20

Titanomagnetite, Magnetic Susceptibility, Magnetic Minerals

Scientific paper

AC susceptibility measurements as a function of field amplitude H ac and of frequency show a strong field dependence for a set of synthetic titanomagnetites (Fe 3- x Ti x O 4 ) and for certain basalts from the SOH-1 Hawaiian drill hole and from Iceland. In-phase susceptibility is constant below fields of about 10-100 A/m, and then increases by as much as a factor of two as H ac is increased to 2000 A/m. Both the initial field-independent susceptibilities and the field-dependence of susceptibility are systematically related to composition: initial susceptibility is 3 SI for a single-crystal sphere of TM0 ( x = 0) and decreases with increasing titanium content; field-dependence is nearly zero for TM0 and increases systematically to a maximum near TM60 ( x = 0.6). This field dependence can in some cases be mistaken for frequency dependence, and lead to incorrect interpretations of magnetic grain size and composition when titanomagnetite is present.

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