Secrets of Mercury's Core
Analyzing the data, scientists have found that Mercury's field is concentrated in the core, with virtually no crustal magnetic field. This is not surprinsing, since the surface so far appears devoid of magnetic minerals. How tiny Mercury maintains a magnetic field has been a mystery for 38 years. If Mercury's core had formed around a tiny singularity, the planet's centre would be a hot cavity of charged plasma. This would generate heat that would reach the surface as vulcanism. If the Black Hole rotated, spinning plasma would create a magnetic field concentrated at the core. Mercury's centre would be an excellent place to find a Black Hole.