1. Department of Chemistry, University of Nebraska, Lincoln, Nebraska 68588, United States
2. Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588, United States
3. Centre for Spintronics and Quantum System, State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, People’s Republic of China
4. Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, United States