The popular science (SciPop) rationalization for the liquid outer core is an ephemeral strand of wispy logic. It predates Stephen Hawking but it's an example of the Hawking Effect. All it has to do is sound plausible.
The Physics of Hell
Ancient Microscopic Mineral Excavation Deepens Mystery of the Origins of Earth’s Magnetic Field
The Earth's magnetic field began on the 2nd day when the inception of gravity initiated the core accretion model.
Journeys to the Center of the Earth
Our planet's core powers a magnetic field that shields us from a hostile cosmos. But how does it really work?
February 18th
If accepting Jesus Christ is how we overcome the gravity of Earth and are caught up to meet Him in the air, then we can have a unified theory which resolves physical laws with God's plan of redemption.