Geomagentic field

The Earth unquestionably has a magnetic field.  RE proposes that the magentic field is generated by the molten outer core of the Earth which is rotating at high speed.

Given the assertion from FE that the Earth is flat and motionless, what then is the FE account of how the geomagnetic field is produced?

Giant magnetic monopole magnet buried deep in the earth.

OR

If using the two pole FE model.

Giant horseshoe magnet deep in the earth.

OK then in both cases, how did they get there?   Horseshoe magnets without exception I think are all manmade. And one thing is for sure, the Earth existed long before humans did.