Grain-size dependence of two-dimensional micromagnetic structures for pseudo-single-domain magnetite (0.2-2.5 μm)

Details Grain-size dependence of two-dimensional micromagnetic structures for pseudo-single-domain magnetite (0.2-2.5 μm) Grain-size dependence of two-dimensional micromagnetic structures for pseudo-single-domain magnetite (0.2-2.5 μm)

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998geoji.134..843f&link_type=abstract

Geophysical Journal International, Volume 134, Issue 3, pp. 843-848.

Astronomy and Astrophysics

Astronomy

5

Domain Structure, Micromagnetic Modelling, Pseudo-Single Domain, Rock Magnetism

Scientific paper

Micromagnetic modelling with a Monte Carlo method was performed to obtain 2-D micromagnetic structures of pseudo-single-domain (PSD) magnetite (0.2-2.5 μm). Cubic model grains were subdivided into a 2-D array with a maximum of 100×100 cells. In order to find an appropriate cell size, the variation of the self-consistency parameter (S) with cell size was examined. We regard solutions with S>0.95, which corresponds to cell sizes <=0.03 μm, as representing realistic micromagnetic structures. For saturation remanence states, we found vortex structures for small PSD grains (<=0.25 μm) and closure domain structures for larger PSD grains (0.6-2.5 μm). Between 0.25 and 0.6 μm, structures remained chaotic even after a very large number of Monte Carlo steps. In grains with a closure domain structure, domain walls were usually subdivided into several segments with opposite polarities of magnetization rotation.

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