1. Institute of Advanced Magnetic Materials and International Research Center for EM Metamaterials College of Materials and Environmental Engineering Hangzhou Dianzi University Hangzhou 310018 China
2. School of Basic Medicine and Nursing Zhongshan Vocational College Nanjing 210049 China
3. State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 China
4. Research Center for Intelligent Sensing Zhejiang Lab Hangzhou 311121 China