1. Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa 920-1192, Japan
2. Department of Physics, Faculty of Mathematics and Natural Science, Universitas Negeri Jakarta, Kampus A Jl. Rawamangun Muka, Jakarta Timur, Indonesia
3. Nanomaterials Research Institute, Kanazawa University, Kanazawa 920-1192, Japan