1. Institute of Advanced Magnetic Materials and International Research Center for EM Metamaterials, College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
2. State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University Xi’an, 710049, China
3. Research Center for Intelligent Sensing, Zhejiang Lab, Hangzhou, 311121, China
4. Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 15850, USA