Comment on 'Spin Ice: Magnetic Excitations without Monopole Signature   Using $\mu$SR' (arXiv:1110.0877)
  Dunsiger and co-workers have criticised our paper on magnetic monopole dynamics spin ice [S. T. Bramwell et al., Nature, 461 956 (2009)]. We consider their criticisms and results but show that these do not warrant any revision of our earlier conclusions. In contrast, we point out that their conclusion of a `new' type of spin dynamics in spin ice is inconsistent with established facts. 
S. T. Bramwell and S. R. Giblin
cond-mat.str-el