1. State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferrometallurgy and School of Materials Science and Engineering; Shanghai University; Shanghai 200072 China
2. Prokhorov General Physics Institute; Russian Academy of Sciences; Ulitsa Vavilova 38 Moscow 119991 Russia
3. CSIRO Mineral Resources; Technology Court; Pullenvale QLD 4069 Australia
4. Anhui Key Laboratory for Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics; Chinese Academy of Sciences; Hefei 230031 China