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Title: Hexagonal close-packed Ni nanostructures grown on the (001) surface of MgO
Authors: Tian, W.
Sun, H.P.
Pan, X.Q.
Yu, J.H.
Yeadon, M.
Boothroyd, C.B.
Feng, Y.P. 
Lukaszew, R.A.
Clarke, R.
Issue Date: 28-Mar-2005
Citation: Tian, W., Sun, H.P., Pan, X.Q., Yu, J.H., Yeadon, M., Boothroyd, C.B., Feng, Y.P., Lukaszew, R.A., Clarke, R. (2005-03-28). Hexagonal close-packed Ni nanostructures grown on the (001) surface of MgO. Applied Physics Letters 86 (13) : 1-3. ScholarBank@NUS Repository.
Abstract: We report the in situ microscopy observation of an unnatural phase of Ni, a highly strained hexagonal close-packed (hcp) form which we believe is stabilized by heteroepitaxial growth on the (001) face of MgO. We find that the nanosized hep nickel islands transform into the normal face-centered cubic structure when the size of the islands exceeds a critical value (about 2.5 nm thick with a lateral size of ∼5 nm). The structural transition proceeds via a martensitic change in the stacking sequence of the close-packed planes. The formation of hep Ni nanostructures with an unusually large crystallographic c/a ratio (∼6% larger than ideal hep) is very interesting for spintronic and recording applications where large uniaxial anisotropies are desirable. © 2005 American Institute of Physics.
Source Title: Applied Physics Letters
ISSN: 00036951
DOI: 10.1063/1.1890472
Appears in Collections:Staff Publications

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