1. Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518052, China
2. Heng Dian Group DMEGC Magnetics Company, Limited, Hengdian Industrial Area, Dongyang City, 322118 Zhejiang Province, China
3. Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore