Open AccessAn experimental study of the intensity and stability of thermoremanent magnetization acquired by synthetic monodomain titanomagnetite substituted by aluminium
Author(s) -
Özdemir Ö.,
O'Reilly W.
Publication year - 1982
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1982.tb06396.x
Subject(s) - thermoremanent magnetization , demagnetizing field , condensed matter physics , remanence , intensity (physics) , field (mathematics) , curie temperature , mineralogy , magnetization , rock magnetism , aluminium , materials science , geology , field intensity , magnetic field , nuclear magnetic resonance , physics , composite material , optics , mathematics , quantum mechanics , ferromagnetism , pure mathematics
Summary. Titanomagnetites of composition Fe 2.4‐δ Al δ Ti 0.6 O 4 and Fe 2.6‐δ Al δ Ti 0–4 O 4 (δ=0, 0.1 and 0.2 in both cases) were prepared in the monodomain state by pulverization of sintered synthetic material. In low fields, the thermoremanence (TRM) was found to be linear with inducing field and of high enough intensity to account for typical natural remanent magnetizations of fresh submarine basalts. The higher field TRM acquisition curves follow the Néel model curve for an assemblage of non‐interacting identical particles in a general way only, the differences being due to interactions, or the range of particle blocking temperatures and volumes or other features of the samples not included in the model. The unblocking temperatures of low field TRM lie in a narrow range below the Curie point. The low field TRM is very resistant to alternating field demagnetization and provides a very striking illustration of the strength of the TRM mechanism in preserving a stable record of a weak magnetic field. The result of a Lowrie‐Fuller test on the material is consistent with the monodomain state.