Stereo-epitaxial growth of single-crystal Ni nanowires and nanoplates from aligned seed crystals

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Title
Stereo-epitaxial growth of single-crystal Ni nanowires and nanoplates from aligned seed crystals
Author(s)
H Lee; Y Yoo; Taejoon Kang; J Lee; E Kim; X Fang; S Lee; B Kim
Bibliographic Citation
Nanoscale, vol. 8, no. 19, pp. 10291-10297
Publication Year
2016
Abstract
Epitaxially grown anisotropic Ni nanostructures are promising building blocks for the development of miniaturized and stereo-integrated data storage kits because they can store multiple magnetic domain walls (DWs). Here, we report stereo-epitaxially grown single-crystalline Ni nanowires (NWs) and nanoplates, and their magnetic properties. Vertical and inclined Ni NWs were grown at the center and edge regions of c-cut sapphire substrates, respectively. Vertical Ni nanoplates were grown on r-cut sapphire substrates. The morphology and growth direction of Ni nanostructures can be steered by seed crystals. Cubic Ni seeds grow into vertical Ni NWs, tetrahedral Ni seeds grow into inclined Ni NWs, and triangular Ni seeds grow into vertical Ni nanoplates. The shapes of the Ni seeds are determined by the interfacial energy between the bottom plane of the seeds and the substrates. The as-synthesized Ni NWs and nanoplates have blocking temperature values greater than 300 K at 500 Oe, verifying that these Ni nanostructures can form large magnetic DWs with high magnetic anisotropy properties. We anticipate that epitaxially grown Ni NWs and nanoplates will be used in various types of 3-dimensional magnetic devices.
ISSN
2040-3364
Publisher
Royal Soc Chem
DOI
http://dx.doi.org/10.1039/c5nr08080k
Type
Article
Appears in Collections:
Division of Biomaterials Research > Bionanotechnology Research Center > 1. Journal Articles
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