Origin of magnetic properties in carbon implanted ZnO nanowires

Title
Origin of magnetic properties in carbon implanted ZnO nanowires
Authors
채근화Y. F. WangY. C. ShaoS. H. HsiehY. K. ChangP. H. YehH. C. HsuehJ. W. ChiouH. T. WangS. C. RayH. M. TsaiC. W. PaoC. H. ChenH. J. LinJ. F. LeeC. T. WuJ. J. WuY. M. ChangK. AsokanT. OhigashiY. TakagiT. YokoyamaN. KosugiW. F. Pong
Keywords
synchrotron radiation; room-temperature ferromagnetism; carbon-doped ZnO-nanowires; ion implantation
Issue Date
2018-05
Publisher
Scientific Reports
Citation
VOL 8-7758-13
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/67949
ISSN
2045-2322
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KIST Publication > Article
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