1. College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, PR China
2. School of Electronics and Information Engineering, Hangzhou Dianzi University, Hangzhou 310018, PR China
3. Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, PR China
4. School of Physics and Optoelectronic Engineering, Foshan University, Foshan 528225, PR China