1. Department of Energy and Materials Engineering; Dongguk University; 26 Pil-dong, 3-ga Jung-gu Seoul 100-715 Republic of Korea
2. Key Laboratory of Polar Materials and Devices (Ministry of Education); Technical Center for Multifunctional Magneto-Optical Spectroscopy (Shanghai); East China Normal University; Shanghai 200241 China
3. Department of Physics; National Chung Hsing University; Taichung 40227 Taiwan
4. IMEP-LAHC; Grenoble-INP; MINATEC; 3 Parvis Louis Neel, BP 257 38016 Grenoble France