Strongest Magnetic Materials: Rare Earths and NdBFe

AI Thread Summary
Rare Earths, specifically Neodymium-Boron-Iron (NdBFe), are recognized as the strongest known magnetic materials. There is no established theoretical limit to magnetic strength, with practical values reaching approximately 30 Tesla in small volumes and around 2 Tesla in Magnetic Resonance Imaging (MRI) machines. The discussion highlights the significance of these materials in various applications and their potential for further advancements. Understanding the capabilities and limitations of these magnetic materials is crucial for future innovations. Overall, NdBFe remains a key focus in the exploration of powerful magnetic materials.
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As far as I am aware, Rare Earths and particularly NdBFe is the strongest known magnetic material. Is this true and what is the strongest magnetic material known that it is in common use and what is possible theoretically? Thank you.
 
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As far as I know there's no theoretical limit. The top value in a small volume is something around 30 T and inside an MNR machine is around 2 T.
 
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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