Theoretical time‐temperature relationships of magnetization for distributions of single domain magnetite grains

H. ‐U Worm, Michael J Jackson

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Experimental studies have demonstrated that demagnetization temperatures for removing thermoviscous magnetizations (TVRMs) in rocks are often higher than predicted by Pullaiah et al.'s time‐temperature (t‐T) nomogram based on Néel's single domain (SD) theory. Better agreement has been found for t‐T relationships based on Walton's calculations invoking volume distributions. It has been pointed out, however, that Walton's formula applies for t‐T conditions for acquisition of magnetization only, not to demagnetization. We applied numerical methods for assessing the true influence of distributions in SD volume. As it turns out, for reasonable volume distributions, the differences between our results and Pullaiah et al.'s simpler approach are marginal; the differences in demagnetization temperature are significant only for moderate‐term low‐temperature acquisition. Discrepancies between experiments and theory appear because rocks contain predominantly pseudo‐single and multi‐domain grains to which SD theory does not apply.

Original languageEnglish (US)
Pages (from-to)1093-1096
Number of pages4
JournalGeophysical Research Letters
Volume15
Issue number10
DOIs
StatePublished - Sep 1988

Fingerprint Dive into the research topics of 'Theoretical time‐temperature relationships of magnetization for distributions of single domain magnetite grains'. Together they form a unique fingerprint.

Cite this