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

Hyoban Lee, Youngdong Yoo, Taejoon Kang, Jiyoung Lee, Eungwang Kim, Xiaosheng Fang, Sungyul Lee, Bongsoo Kim

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)10291-10297
Number of pages7
JournalNanoscale
Volume8
Issue number19
DOIs
StatePublished - May 21 2016

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