铁磁性和粒子碰撞：应用于原行星盘和陨石记录
Ferromagnetism and particle collisions: applications to protoplanetary disks and the meteoritical record
摘要：
陨石记录显示铁分配和钨同位素分配之间的矩阵和球粒。钨的丰度不足以驱动其自身的同位素分配，但如果钨与铁相关，那么铁磁相互作用颗粒可以帮助解释这两种观察结果。我们推导出一个实用的参数化粒子相互吸引的粒子磁偶极矩所造成的粒子-粒子碰撞率的增加。虽然适当的磁性参数仍然不确定，我们表明，在原行星盘的环境磁场预计将足够强，磁化铁金属轴承尘埃颗粒足以驱动大的增加，其碰撞率。这种富含铁金属的颗粒之间碰撞率的增加可能有助于保持原始铁和W同位素的不均匀性，并有助于解释为什么陨石记录显示它们在太阳星云中的分配。磁相互作用的重要性较大的晶粒的增长是平衡的破碎是不太清楚，将需要未来的实验室或数值研究。
英文摘要：
The meteoritical record shows both iron partitioning and tungsten isotopic partitioning between matrix and chondrules. Tungsten is not abundant enough to have driven its own isotopic partitioning, but if tungsten were correlated with iron, then ferromagnetic interactions grains could help explain both observations. We derive a practical parameterization for the increase in particle-particle collision rates caused by mutually attracting particle magnetic dipole moments. While the appropriate magnetic parameters remain uncertain, we show that ambient magnetic fields in protoplanetary disks are expected to be strong enough to magnetize iron metal bearing dust grains sufficiently to drive large increases in their collision rates. Such increased collision rates between iron metal rich grains could help preserve primordial iron and W isotopic inhomogeneities; and would help explain why the meteoritical record shows their partitioning in the solar nebula. The importance of magnetic interactions for larger grains whose growth is balanced by fragmentation is less clear, and will require future laboratory or numerical studies.
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