Mechanism of angular momentum transfer from microwaves to a copper ring Olivier Emile, Ronan Niemiec, Christian Brousseau, Janine Emile, Kouroch Mahdjoubi, Wenlong Wei and Bo Thide Eur. Phys. J. D, 70 8 (2016) 172 Published online: 30 August 2016 DOI: 10.1140/epjd/e2016-70193-6