Journal
APPLIED PHYSICS LETTERS
Volume 97, Issue 3, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3467202
Keywords
annealing; cobalt alloys; diffusion; electron energy loss spectra; exchange interactions (electron); iron alloys; nanocomposites; nanomagnetics; samarium alloys; transmission electron microscopy
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Funding
- ONR/MURI [N00014-05-1-0497]
- DARPA/ARO [W911NF-08-1-0249]
- U.S. Department of Energy, Office of Basic Energy Science [DE-AC02-07CH11358]
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We demonstrate homogenous distribution of bcc FeCo soft phase with grain size of 20-30 nm in the annealed Sm-Co/Fe bulk samples by energy filtered transmission electron microscopy (EFTEM). Quantitative Co/Fe interdiffusion measured using both energy dispersive spectroscopy (EDS) and parallel electron energy loss spectroscopy (PEELS) shows Fe60 +/- 5%Co40 +/- 5% for the magnetically soft bcc phase and Sm-2(Co0.82Fe0.18)(7) and Sm(Co0.80Fe0.20)(5) respectively for the magnetically hard phases in these two alloy systems after optimal annealing. The graded interface develops in both samples due to the Co/Fe interchange between the hard and soft phases and the bcc soft phase was determined. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3467202]
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