[1] School of Materials Science and Engineering, South China University of Technology, Guangzhou,510640, China
[2] Baotou Research Institute of Rare Earths, Baotou,014030, China
[3] Jiangxi Key Laboratory for Rare Earth Magnetic Materials and Devices & Institute for Rare Earth Magnetic Materials and Devices (IREMMD), Jiangxi University of Science and Technology, Ganzhou,341000, China
[4] School of Materials Science and Engineering, Nanyang Technological University, Singapore,639798, Singapore