1. School of Physics and Electronic Science & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, No.500 Dongchuan Road, Shanghai 200241, P R China
2. College of Logistics Engineering, Shanghai Maritime University, No. 1550 Haigang Avenue, Shanghai 201306, P. R. China
3. Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes, Suzhou University, Educational Park No. 1769 Xuefu Avenue, Suzhou 234000, P. R. China