[1] Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen,40002, Thailand
[2] School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima,30000, Thailand
[3] Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen,40002, Thailand