[1] Center for NanoBioEngineering and Spintronics, Department of Materials Science and Engineering, Chungnam National University, Daejeon,305-764, Korea, Republic of
[2] Department of Emerging Material Science, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, Korea, Republic of
[3] Ceramics Department, National Research Centre, Cairo,12311, Egypt
[4] Department of Physics, Andhra University, Visakhapatnam,530003, India
[5] Physics Department, Faculty of Science, El-Minia University, Egypt