R. Das (Department of Physics, University of South Florida, Tampa, FL, 33620, USA), N.T. Dang (Institute of Research and Development, Duy Tan University, 550000, Danang, Viet Nam), V. Kalappattil (Department of Physics, University of South Florida, Tampa, FL, 33620, USA), R.P. Madhogaria (Department of Physics, University of South Florida, Tampa, FL, 33620, USA), T.P.T. Nguyen (Institute of Research and Development, Duy Tan University, 550000, Danang, Viet Nam), L.T.P. Thao (University of Education, The University of Danang, 550000, Danang, Viet Nam), N.S. Bingham (Department of Applied Physics, Yale University, New Haven, CT, 06511, USA), H. Srikanth (Department of Applied Physics, Yale University, New Haven, CT, 06511, USA), M.H. Phan (Department of Applied Physics, Yale University, New Haven, CT, 06511, USA)

DN-6