Origin of magnetic properties in carbon implanted ZnO nanowires.
Origin of magnetic properties in carbon implanted ZnO nanowires.
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DOI:
10.1038/s41598-018-25948-x
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发表时间:
2018-05-17
影响因子:
4.6
通讯作者:
Pong WF
中科院分区:
文献类型:
--
作者:
Wang YF;Shao YC;Hsieh SH;Chang YK;Yeh PH;Hsueh HC;Chiou JW;Wang HT;Ray SC;Tsai HM;Pao CW;Chen CH;Lin HJ;Lee JF;Wu CT;Wu JJ;Chang YM;Asokan K;Chae KH;Ohigashi T;Takagi Y;Yokoyama T;Kosugi N;Pong WF
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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影响因子:
3.7
作者:
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通讯作者:
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