On the growth and coalescence of the epitaxial islands of L1(0)-FePt (001) thin-film

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The growth and coalescence behavior of L1(0)-FePt (001) epitaxial islands have been studied using in-plane and cross-section HRTEM study. In particular, the defect structure of coalesced boundary has been investigated utilizing FFT technique by investigating the defects of lattice-fringes of boundary plane near the boundary. The growth of epitaxial islands, at low deposition rate, leads to a development of an island-network structure, which consists of a network of inter-island space channels (IISCs). The IISCs are basically composed of two-90 degrees (110) s and one (200), which are slightly adjusted at a corner to meet the force balance. The space-channels remaining un-filled up to percolation-stage are mostly two 90 degrees (110) channels because of the presence of two chemically distinctive (110) surfaces. The coalescence of island network structure occurs either by "crack-closure" (zipping) mechanism or by "groove-filling" mechanism by repeated epitaxial growth. The defect structure in a simple "zipped" interface consists of two asymmetrical tilt boundaries with opposite sense to minimize the strain energy. The magnetic coercivity and nucleation field, which are large in island-network structure, decrease significantly with the progress of coalescence due to the introduction of defects at the interface. Published by AIP Publishing.
Publisher
AMER INST PHYSICS
Issue Date
2016-10
Language
English
Article Type
Article
Citation

JOURNAL OF APPLIED PHYSICS, v.120, no.16

ISSN
0021-8979
DOI
10.1063/1.4966169
URI
http://hdl.handle.net/10203/214841
Appears in Collection
MS-Journal Papers(저널논문)
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