Origin of magnetic properties in carbon implanted ZnO nanowires
- Origin of magnetic properties in carbon implanted ZnO nanowires
- 채근화; Y. F. Wang; Y. C. Shao; S. H. Hsieh; Y. K. Chang; P. H. Yeh; H. C. Hsueh; J. W. Chiou; H. T. Wang; S. C. Ray; H. M. Tsai; C. W. Pao; C. H. Chen; H. J. Lin; J. F. Lee; C. T. Wu; J. J. Wu; Y. M. Chang; K. Asokan; T. Ohigashi; Y. Takagi; T. Yokoyama; N. Kosugi; W. F. Pong
- synchrotron radiation; room-temperature ferromagnetism; carbon-doped ZnO-nanowires; ion implantation
- Issue Date
- Scientific Reports
- VOL 8-7758-13
- 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.
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