Why would it be unlikely that the earth has a fixed magnetized inner core?

Question

rather than magnetism being produced by the geodynamo. Why is it that the geodynamo doesnt explain geomagnetic reversals, what causes them to happen.

Answer 1

Few if any materials can maintain a fixed magnetic domain orientation at such high temperatures.  We have fairly good evidence that the reversals happened, but we don't know why.

Answer 2

Core is molten.  Molten materals cannot be magnets

Answer 3

i really don't know but it seems if geomagnetic reversal were to happen it would be tremendous. if gravity affects light doesn't it affect earths magnetic field also.