A solution looking for some problems -- "Spin waves carry energy from cold to hot" http://physicsworld.com/cws/article/news/2013/apr/22/spin-waves-carry-energy-from-cold-to-hot
"Unidirectional spin-wave heat conveyer" http://www.nature.com/nmat/journal/vaop/ncurrent/abs/nmat3628.html "Spin-wave propagation and transformation in a thermal gradient" http://arxiv.org/abs/1211.5017
