1. Engineering Research Center of High-frequency Soft Magnetic Materials and Ceramic Powder Materials of Anhui Province, Chaohu University, 1 Bantang Road Chaohu, Hefei, 238024, P. R. China
2. Baoji Oilfield Machinery Co., Ltd, Baoji, 721002, P. R. China
3. Hefei Jingchuang Technology Co., Ltd, Hefei, 231500, P. R. China