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The meteoritical record shows both iron partitioning and tungsten isotopicpartitioning between matrix and chondrules. Tungsten is not abundant enough tohave driven its own isotopic partitioning, but if tungsten were correlated withiron, then ferromagnetic interactions grains could help explain bothobservations. We derive a practical parameterization for the increase inparticle-particle collision rates caused by mutually attracting particlemagnetic dipole moments. While the appropriate magnetic parameters remainuncertain, we show that ambient magnetic fields in protoplanetary disks areexpected to be strong enough to magnetize iron metal bearing dust grainssufficiently to drive large increases in their collision rates. Such increasedcollision rates between iron metal rich grains could help preserve primordialiron and W isotopic inhomogeneities; and would help explain why themeteoritical record shows their partitioning in the solar nebula. Theimportance of magnetic interactions for larger grains whose growth is balancedby fragmentation is less clear, and will require future laboratory or numericalstudies.

Ferromagnetism and particle collisions: applications to protoplanetary disks and the meteoritical record