[oil pan 4]

There is also the curie point where iron loses it stops being magnetic.

But what appears to be happening is the same phenomenon that creates metallic magnetic liquid hydrogen like in Jupiter's core and magnetic cryogenic oxygen. Where the elements density is so high to where an element retains or gains magnetic properties. So even though the earths core is something like 10,000°F minimum, the density is higher than sold iron at room temperature here at ground level.
So the hot iron nickel core isn't just magnetic, it's super magnetic compared to normal density iron nickel alloys at surface level.