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Origin of magnetic properties in carbon implanted ZnO nanowires.
Wang, Y F; Shao, Y C; Hsieh, S H; Chang, Y K; Yeh, P H; Hsueh, H C; Chiou, J W; Wang, H T; Ray, S C; Tsai, H M; Pao, C W; Chen, C H; Lin, H J; Lee, J F; Wu, C T; Wu, J J; Chang, Y M; Asokan, K; Chae, K H; Ohigashi, T; Takagi, Y; Yokoyama, T; Kosugi, N; Pong, W F.
Afiliação
  • Wang YF; Department of Physics, Tamkang University, Tamsui, 251, Taiwan.
  • Shao YC; Department of Physics, Tamkang University, Tamsui, 251, Taiwan.
  • Hsieh SH; Department of Physics, Tamkang University, Tamsui, 251, Taiwan.
  • Chang YK; Department of Physics, Tamkang University, Tamsui, 251, Taiwan.
  • Yeh PH; Department of Physics, Tamkang University, Tamsui, 251, Taiwan.
  • Hsueh HC; Department of Physics, Tamkang University, Tamsui, 251, Taiwan. hchsueh@mail.tku.edu.tw.
  • Chiou JW; Department of Applied Physics, National University of Kaohsiung, Kaohsiung, 811, Taiwan. jwchiou@nuk.edu.tw.
  • Wang HT; Department of Physics, National Tsinghua University, Hsinchu, 300, Taiwan.
  • Ray SC; Department of Physics, University of South Africa, Johannesburg, South Africa.
  • Tsai HM; National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan.
  • Pao CW; National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan.
  • Chen CH; National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan.
  • Lin HJ; National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan.
  • Lee JF; National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan.
  • Wu CT; Department of Chemical Engineering, National Cheng Kung University, Tainan, 701, Taiwan.
  • Wu JJ; Department of Chemical Engineering, National Cheng Kung University, Tainan, 701, Taiwan.
  • Chang YM; Center for Condensed Matter Sciences, National Taiwan University, Taipei, 106, Taiwan.
  • Asokan K; Inter-University Accelerator Center, Aruna Asaf Ali Marg, New Delhi, 110 067, India.
  • Chae KH; Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea.
  • Ohigashi T; Institute for Molecular Science, Okazaki, 444-8585, Japan.
  • Takagi Y; Institute for Molecular Science, Okazaki, 444-8585, Japan.
  • Yokoyama T; Institute for Molecular Science, Okazaki, 444-8585, Japan.
  • Kosugi N; Institute for Molecular Science, Okazaki, 444-8585, Japan.
  • Pong WF; Department of Physics, Tamkang University, Tamsui, 251, Taiwan. wfpong@mail.tku.edu.tw.
Sci Rep ; 8(1): 7758, 2018 May 17.
Article em En | MEDLINE | ID: mdl-29773822
Various synchrotron radiation-based spectroscopic and microscopic techniques are used to elucidate the room-temperature ferromagnetism of carbon-doped ZnO-nanowires (ZnO-C:NW) via a mild C+ ion implantation method. The photoluminescence and magnetic hysteresis loops reveal that the implantation of C reduces the number of intrinsic surface defects and increases the saturated magnetization of ZnO-NW. The interstitial implanted C ions constitute the majority of defects in ZnO-C:NW as confirmed by the X-ray absorption spectroscopic studies. The X-ray magnetic circular dichroism spectra of O and C K-edge respectively indicate there is a reduction in the number of unpaired/dangling O 2p bonds in the surface region of ZnO-C:NW and the C 2p-derived states of the implanted C ions strongly affect the net spin polarization in the surface and bulk regions of ZnO-C:NW. Furthermore, these findings corroborate well with the first-principles calculations of C-implanted ZnO in surface and bulk regions, which highlight the stability of implanted C for the suppression and enhancement of the ferromagnetism of the ZnO-C:NW in the surface region and bulk phase, respectively.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2018 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2018 Tipo de documento: Article