Thermal demagnetization of VRM and pTRM of single domain magnetite - No evidence for anomalously high unblocking temperatures

Details Thermal demagnetization of VRM and pTRM of single domain magnetite - No evidence for anomalously high unblocking temperatures Thermal demagnetization of VRM and pTRM of single domain magnetite - No evidence for anomalously high unblocking temperatures

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1939d&link_type=abstract

Geophysical Research Letters (ISSN 0094-8534), vol. 20, no. 18, p. 1939-1942.

Physics

18

Demagnetization, Magnetite, Paleomagnetism, Grain Size, High Temperature, Limestone

Scientific paper

Stepwise thermal demagnetization of viscous remanent magnetization (VRM) and partial thermoremanent magnetization (pTRM) of single-domain magnetite with mean grain size 37 nm reveals only minor deviations from the predictions of Neel theory. Three different initial states were used, following (1) alternating field demagnetization to 100 mT, (2) thermal demagnetization to 610 C, and (3) modified thermal demagnetization, consisting of zero-field heating to 610 C followed by zero-field cooling to the VRM or pTRM acquisition or blocking temperature, TB. VRMs were produced by applying a 0.1 mT field for 3.5 hr, starting from initial states 2, 3 and 1, in that order, at TB = 283 C and from states 3, 2 and 1 at TB = 404 C. In a final experiment, pTRM was produced by applying 0.1 mT during cooling from TB1 = 414 C to TB2 = 404 C, starting from state 3. In all but one case, VRM began to unblock significantly (90 percent of initial intensity) about 15 C below TB, dropped to 50 percent at TB, and then tailed off, dropping below 10 percent 40 C above TB = 283 C or 25 C above TB = 404 C. Although very long acquisition times cannot be tested, we find no evidence for anomalously high TUBs of VRM in single-domain grains.

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