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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/113425


    Title: Origin of magnetic properties in carbon implanted ZnO nanowires
    Authors: Y. F. Wang;Y. C. Shao;S. H. Hsieh;Y. K. Chang;P. H. Ye h;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;K. H. Chae;T. Ohigashi;Y. Takagi;T. Yokoyama;N. Kosugi;W. F. Pong
    Date: 2018-05-17
    Issue Date: 2018-05-18 12:10:12 (UTC+8)
    Publisher: Springer Nature
    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.
    Relation: Scientific Reports 8, p.7758
    DOI: 10.1038/s41598-018-25948-x
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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