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Does macroscopic magnetic monopole contradict physics?

  1. Apr 15, 2012 #1
    I know Dirac had said yes to existence of microscopic monopole by quantum theory, so why not the macroscopic monopole?
     
  2. jcsd
  3. Apr 15, 2012 #2

    vanhees71

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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!
     
  4. Apr 17, 2012 #3
    OK, since the quasipartical behaves like monopole, dose it produce magnetic field? Does moving "spin ice" produce EMR?
     
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