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Does macroscopic magnetic monopole contradict physics?

by liumylife
Tags: magnetic, monopole
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liumylife
#1
Apr15-12, 07:55 AM
P: 11
I know Dirac had said yes to existence of microscopic monopole by quantum theory, so why not the macroscopic monopole?
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vanhees71
#2
Apr15-12, 10:12 AM
Sci Advisor
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P: 2,493
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!
liumylife
#3
Apr17-12, 11:43 PM
P: 11
OK, since the quasipartical behaves like monopole, dose it produce magnetic field? Does moving "spin ice" produce EMR?


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