Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 731, Issue -, Pages 554-559Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.10.003
Keywords
FePt nano-cluster; RHEED; TEM; GPA; Strain; Optical properties
Categories
Funding
- National Key Scientific Instrument and Equipment Development Project of China [2014YQ090709]
- National Natural Science Foundation of China (NSFC) [11404302]
- Laser fusion research center funds for young talents [RCFPD1-2017-9]
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The FePt nano-clusters (NCs): MgO nanocomposite films were successfully fabricated by pulsed laser deposition at 650 degrees C. In-situ reflection high-energy electron diffraction (RHEED) analysis indicates the existence of epitaxial strain in the FePt cluster. This strain was identified quantitatively (1.2% and 0.66% at in-plane and out-of-plane direction) via strain mapping by geometric phase analysis (GPA) at nano-scale. A further microstructure investigation by transmission electron microscopy (TEM) shows the lop-angle triangle structure of FePt NCs, which is considered to be caused by the strain difference in two directions. Two absorption peaks has been observed in the range of 4-6.5 eV by ultravioletevisible, which were attributed to the existence of grain boundary and defects caused by the embedding of FePt in MgO. This work provided important information for its further research and performance improvement in many potential applications. (C) 2017 Published by Elsevier B.V.
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