Does a Rotating Bar Magnet Emit Magnetic Dipole Radiation?

[quantumfireball]

What is the nature of magnetic dipole radiation?
Does a rotating bar magnet give rise to electromagnetic radiation(magnetic dipole radiation to be more specific)??

 

[Meir Achuz]

A rotating bar magnet would produce MD radiation, but it would have to be rotating very fast. MD radiation is just like ED radiation, but has B in the plane of r and an oscillating dipole, while ED has E in that plane. A rotating magnet would produce circular polarization along the axis of rotation, and plane polarization perpendicular to the axis.

 

[aferd]

Im currently stuck on a related problem. I cannot figure out the conditions under which a rotation magnetic dipole moment will radiate.

If I know a MD M is rotating with angular frequency w, how would you find the conditions under which it will radiate? I know if you went into it thoroughly you can figure out the power radiated by explicitly finding E and B to find the radiative component of S, but I still don't know the relationship between M and w that allows it to radiate.