Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.268...40s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 268, NO. 1/MAY1, P. 40, 1994
Astronomy and Astrophysics
Astronomy
13
Molecular Processes - Polarization - Dust, Extinction
Scientific paper
It has been frequently suggested that interstellar dust grains contain clusters of metallic iron, iron sulphides or magnetic iron oxides having superparamagnetic properties. This paper presents a simple model for the origin of superparamagnetism in H2O ice mantle grains. According to this model, impurity Fe atoms in H2O ice mantles are rapidly oxidized to magnetite (Fe3O4) precipitates during mantle heating by cosmic ray impacts. These precipitates undergo ferromagnetic coupling and aggregate into single-domain Fe3O4 particles uniformly dispersed throughout the mantle like raisins in a pudding. The single-domain particles behave like an assembly of superparamagnets, greatly enhancing Davis-Greenstein alignment of core-mantle grains in dense clouds. Superparamagnetism alone, however, cannot explain the polarized far-infrared emission observed from cold dust in Orion clouds.
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