The surface starts to cool and solidify. The solid rock will assume the magnetic orientation of the Solar magnetic field. About every 11 years the Sun's magnetic field reverses, so the solid rock will be layered with alternating polarity as it's solidification descends.
Gradually the electromagnet's iron core will use the solid crustal magnetic rock to form a flux path allowing the formation of a surface magnetic field, trapping and concentrating the internal electromagnetic field.
Lightning will be produced in the clouds, and this will slowly alter the atmospheric chemical composition to create a livable atmosphere, and water vapor.
At this stage the planet will be like Venus. The gravity will be similar to our non rotating Moon, but disproportionate to the Earth's gravity. This is Static Gravity, derived only from mass, and dinosaurs could possibly live in these conditions.
At some point the solid rock crust will very slowly start to rotate, and this will be caused by the same means as the atmospheric wind.
As the planet's crust rotates, the internal electromagnet remains stationary, or perhaps locked to the Sun's core rotation. The differential in speed between the electromagnetic field and the rotating crust means that the entire crust and possibly some of the molten area are being swept by a huge and super powerful electromagnetic field. Any non magnetic, highly conductive metals swept by this field will at some speed create the huge magnetosphere, and also the ionosphere. This field is a Dynamic Gravitational Field, but is known and used practically as Electrodynamic Suspension
or Electrodynamic Braking. Drag associated with this field creation would ensure the area remains in a molten state.
The ionosphere will create a secondary light source as it interacts with the Sun's rotating field. This light will be blue and may create more illumination than that directly from the Sun. These huge, possibly infinite fields, are Dynamic Gravitational Fields, and are most likely created and propagate instantaneously. This DGF will sense and interact with all similar fields, at a frequency we call the Schumann Resonance. I believe we may be in error when we call these fields a magnetic field. I suggest that the magnetism they contain is information, and they would also contain a copy of all electromagnetic information, including light, and transmit this to the universe.
This DGF emerges from the surface at the surface rotational velocity. The Planetary magnetic field, while virtually stationary, would be sweeping us at about 1000MPH at the equator.
The ionosphere creates a graduated charge differential between the surface and ionosphere, and this creates the gravitational force we feel. This force is derived from the planetary rotational speed and the strength of the internal electromagnet. In the case of Earth this Dynamic Gravity exceeds and overrides the original Static Gravity. I suggest that the dinosaurs lived on Earth at a time before the planet's rotation began, or when rotation was minimal.
The suggestion that Schumann Resonance is caused by lightning strokes is unlikely to be correct. It is more likely the other way around. It is also likely that if our DGF is the result of Solar electrical plasma input, then any climatic changes associated with Sun Spot variations may be attributed to Ionospheric disturbance from within the planet.
I also suggest that the "Goldilocks Zone"idea for inhabitable planets is incorrect. Any planet with the required fields would be illuminated by it's ionosphere. This would work because Saturn, for example, although 10 times further from the Sun than Earth, would be swept by the Sun's rotating DGF at 10 times the speed that Earth is swept.
Earth about 1 million KPH, Saturn about 10 million KPH.