multiples of single groin magnetic moment
Figure 1. Measured magnetic dipole moments of individual grains. The data has been normalized with the nominal value ¡/z[ « 3 • 10-13 Am2. Errors apply to all the data.
solar nebula as a result of various melting processes [9,10]. Potentially magnetic minerals such as magnetite, phyrrotite, and iron-nickel have been detected in meteoritic samples  and in comet P/Halley's dust . Together with the strong nebular magnetic fields that are inferred from the paleomagnetic record in meteorites , this should have produced a population of magnetized dust grains.
The long-ranged interactions between magnetized dust grains are responsible for an enhanced collisional cross section a for these particles, thus inducing a selective growth mechanism together with an acceleration of the coagulation process itself. Numerical simulations by Niibold and Glassmeier  and Niibold, Dominik, and Glassmeier  have been able to quantify this enhancement. As has been shown experimentally by Nuth et al. , magnetic dust aggregation creates web-like structures that could act as 'fishing nets' for nonmagnetic particles. This could serve as a starting point for rapid grain growth and new compositional features . Ideally dipolar interactions between magnetized grains lead to elongated structures that could explain interstellar polarization of starlight (e.g. ) and may have been found in meteoritic samples . As an experimental test for these considerations we performed analogous experiments with magnetized micron-sized dust grains. In this paper, we will report on first results and future perspectives.
Was this article helpful?