A new form of 'waveguide' has been demonstrated that can provide a path for magnetic fields, allowing the field to affect a region far removed from the magnetic poles
http://arxiv.org/abs/1304.6300
and
http://www.newscientist.com/article...conducting-hose-transmits-magnetic-field.html
http://arxiv.org/abs/1304.6300
and
http://www.newscientist.com/article...conducting-hose-transmits-magnetic-field.html