Does macroscopic magnetic monopole contradict physics?

AI Thread Summary
The discussion explores the concept of macroscopic magnetic monopoles, referencing Dirac's support for microscopic monopoles through quantum theory. It highlights the absence of fundamental magnetic charges in nature as a puzzling phenomenon. The conversation introduces "spin ice," a material exhibiting collective excitations that mimic magnetic monopoles. Questions arise regarding whether these quasiparticles generate magnetic fields and if moving "spin ice" could produce electromagnetic radiation. The topic raises intriguing implications for condensed matter physics and the nature of magnetic charges.
liumylife
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I know Dirac had said yes to existence of microscopic monopole by quantum theory, so why not the macroscopic monopole?
 
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Indeed, there's no principle against the existence of magnetic monopoles. In this sense it's a mystery, why there are no elementary magnetic charges in nature.

However, not long ago, one has found a funny material, which behaves like a socalled "spin ice". In this substance one has found collective excitations (quasiparticles) which behaves like magnetic monopoles. There are a lot of such examples in condensed matter physics!
 
OK, since the quasiparticle behaves like monopole, dose it produce magnetic field? Does moving "spin ice" produce EMR?
 
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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