How Does Earth's Magnetic Field Persist Despite High Temperatures?

AI Thread Summary
Earth's magnetic field persists despite the high temperatures of the outer and inner core, which exceed the Curie temperature of iron. The core's ability to maintain magnetic properties is attributed to the movement of molten iron, which generates electric currents. These currents are crucial for sustaining the magnetic field. Unlike materials such as gold or copper, iron retains its magnetic characteristics under these conditions. The discussion highlights the unique properties of iron in the context of Earth's magnetic field generation.
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Hi, everyone.

I read how occurs magnetic field in Earth. However, the temperature of outer and inner core is bigger than Curie temperature of iron. So, I have one question. If they have bigger temperature than Curie temperature, how they can have magnetic properties?

Thank you.
 
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They still carry currents. This would be true if the core were made of gold or copper instead of iron.
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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