Affiliation: | C. Sirisathitkul 1) , P. Jantaratana 2) 1) Magnet Laboratory,Molecular Technology Research Unit,School of Science,Walailak University,Nakon Si Thammarat 80161,Thail, 2) Electricity , Magnetism Properties Research Laboratory,Department of Physics,Faculty of Science,Kasetsart University,Bangkok 10900,Thail, |