Retno Asih, Rosana Martina Dhari, Malik Anjelh Baqiya, Fahmi Astuti, Heru Harsono, Chatree Saiyasombat, Takayuki Kawamata, Takashi Noji, Hidetaka Sato, Masatsune Kato, Isao Watanabe, Darminto
Effects of Mn-substitution on magnetic properties of Zn1-xMnxO (MZO) nanoparticles with x= 0.00, 0.03, 0.05 and 0.07 have been investigated along with their local structure. The study on Mn K-edge XANES spectra of MZO reveals that the oxidation state increases by the Mn-substitution, which further implies that MZO exhibits a mixed valence state of Mn3+/Mn4+. The local structure analysis on Mn K-edge EXAFS spectra shows that the coordination number (CN) of Mn reduces by increasing Mn concentration, thus the amount of oxygen vacancy (VO) increases by the Mn-substitution. Interestingly, the magnetization of MZO also tend to increase as the Mn concentration increases. The M(H) curves exhibit linear (paramagnetic) behavior, showing no evidence of room-temperature ferromagnetism. Our results show that the magnetism of MZO is related to the correlation between the Mn magnetic moment and VO. © 2020 Trans Tech Publications Ltd, Switzerland.
Department of Physics, Faculty of Science, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia; Meson Science Laboratory, RIKEN Nishina Center, Wako, 351-0198, Japan; Department of Physics, Faculty of Mathematic and Natural Science, University of Brawijaya, Malang, 65145, Indonesia; Synchroton Light Research Institute, 111 University Avenue, Muang District, Nakhon Ratchasima, 3000, Thailand; Department of Applied Physics, Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan; Center of Excellence in Automotive Control and System, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia
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