1. School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, Arizona 85287, USA
2. Department of Physics, Arizona State University, Tempe, Arizona 85287, USA
3. School of Physical Science and Technology, and Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University, Lanzhou, Gansu 730000, China
4. Institute for Complex Systems and Mathematical Biology, King's College, University of Aberdeen, Aberdeen AB24 3UE, United Kingdom