Affiliation: | 1. State Key Discipline Laboratory of Wide Bandgap Semiconductor Technologies, School of Microelectronics, Xidian University, Xi'an 710071, P. R. China;2. Institute of Microelectronics, Key Laboratory for Magnetism and Magnetic Materials of MOE, School of Physical Science and Tech‐nology, Lanzhou University, Gansu 730000, P. R. China |