1. School
of Physics, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand
2. SUPA,
School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife KY16 9SS, United Kingdom
3. Kavli
Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, United States
4. Laboratory
of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, New York 14853, United States
5. Materials
and Structures Laboratory, Tokyo Institute of Technology, Kanagawa 226-8503, Japan
6. Advanced
Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
7. Department
of Physics, Boston College, Chestnut Hill, Massachusetts 02467, United States
8. Department
of Physics, University of Tokyo, Hongo, Tokyo 113-0033, Japan
9. Magnetic
Materials Laboratory, RIKEN Advanced Science Institute, Wako, Saitama 351-0198, Japan
10. Département
de Physique de la Matière Condensée, Universitée de Genève, 24 Quai Ernest-Ansermet, 1211 Genève 4, Switzerland
11. Swiss
Light Source, Paul Scherrer Institut, CH-5232 Villigen
PSI, Switzerland
12. NANOTEC-SUT
Center of Excellence on Advanced Functional Nanomaterials, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand