High temperature ferromagnetic ordering in c-axis orientedZnO:Mnnanoparticle thin films by tailoring substrate temperature

作     者：Usman Ilyas P. Lee T. L. Tan R. V. Ramanujan Sam Zhang R. Chen H. D. Sun R. S. Rawat 

作者机构：National Institute of Education Nanyang Technological University 1 Nanyang Walk 637616 Singapore Department of Physics University of Engineering & Technology Lahore 54890 Pakistan School of Material Science and Engineering Nanyang Technological University 639798 Singapore School of Mechanical and Aerospace Engineering Nanyang Technological University 639798 Singapore Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link 637371 Singapore 

出 版 物：《International Journal of Modern Physics: Conference Series》 

年 卷 期：2014年第ijmpcs卷第32期

学科分类：07[理学] 0702[理学-物理学] 

主　　题：Spintronics ZnO:Mn nanoparticle thin films structural defects substrate temperature 

摘      要：This study reports the enhanced ferromagnetic ordering in ZnO:Mn nanoparticle thin films, grown at different substrate temperatures using pulsed laser deposition. The optimum growth conditions were deduced from X-ray, photoemission and magnetic measurements. The X-ray measurements reveal that there was an optimum substrate temperature where the thin films showed relatively stronger texture, better crystallinity and lower strain. Substrate temperature tuned the deep level recombination centers in ZnO:Mn , which changed the optical quality by altering the electronic structure. The M-H curves, in the present study, revealed superior ferromagnetic response of 20-nm sized particles in ZnO:Mn thin film grown at a substrate temperature of 450 °C. Ferromagnetic ordering becomes weaker at higher/lower substrate temperatures due to the activation of native defects in ZnO host matrix.