One-way transparency of four-coloured spin-wave excitations in multiferroic materials

I. Kézsmárki,  D. Szaller,  S. Bordács,  V. Kocsis,  Y. Tokunaga,  Y. Taguchi,  H. Murakawa,  Y. Tokura,  H. Engelkamp,  T. Rõõm  & U. Nagel
Nature Communications 5, Article number: 3203 doi:10.1038/ncomms4203
Received 02 October 2013 Accepted 06 January 2014 Published 03 February 2014