Abstract
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 Sm2(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.
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