The causes of low-temperature demagnetization of remanence in multidomain magnetite

Details The causes of low-temperature demagnetization of remanence in multidomain magnetite The causes of low-temperature demagnetization of remanence in multidomain magnetite

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000geoji.140..115m&link_type=abstract

Geophysical Journal International, Volume 140, Issue 1, pp. 115-131.

Astronomy and Astrophysics

Astronomy

20

Low-Temperature Properties, Magnetite, Rock Magnetism

Scientific paper

In this paper, the mechanisms of low-temperature demagnetization of remanence in multidomain magnetite are considered. New experimental observations of the behaviour of the saturation isothermal remanence, thermoremanence and partial thermoremanence at low temperatures are presented. The results show that there are two main contributions to this low-temperature demagnetization. The first and predominant contribution (type-1 demagnetization) is due to `kinematic' domain state reorganization and occurs throughout cooling from room temperature to the Verwey transition, Tv, at 120-124 K. The second contribution arises from the change in anisotropy from cubic to monoclinic at Tv, which changes the overall domain structure of the grain. On warming in zero field, some domain walls will not return to their original positions but will take up a position that leads to a lower net remanence (type-2 demagnetization). In stoichiometric magnetite, demagnetization does not occur at 130 K at the isotropic point, Tk, contrary to some previous predictions. In non-stoichiometric magnetite, the influence of the Verwey transition is greatly reduced, and anomalous behaviour is observed at Tk.

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