Refining the formation of nanocrystals in soft magnetic amorphous alloy via EXAFS spectroscopic analyses
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The amorphous metallic alloy with the composition Fe73.5Nb3Cu1Si13.5B9 is now quite well known as FINEMET, mainly owing to its excellent magnetic properties that are supposed to be due to the formation of small nanocrystals consisting of Fe and Si, i.e., DO3 phases, during simple heat treatment [1, 2, 3]. The evolution of such nanocrystals and their effects on the magnetic properties were comprehensively described in previous reports [4, 5, 6]. With using mainly the Fe K-edge and Cu K-edge EXAFS spectra, Ayers et al. carefully studied nucleation kinetics of samples that were heat-treated at various durations [7, 8]. In particular, the role of Cu on nucleation processes in this noncrystalline metal was largely proven by experimental observations of a series of Fourier-transformed EXAFS spectra taken at the Cu K-edge of differently heat-treated samples. A key point in their nucleation model for this amorphous metal is that Cu clusters act as nucleation sites of the DO3...
KeywordsAmorphous Metal EXAFS Spectrum EXAFS Oscillation Partial Radial Distribution Function FEFF8 Code
YGC acknowledges the support of the 2004 Hankuk Aviation University Faculty Research Grant. The X-ray absorption measurements carried out at Pohang Light Source were partially subsidized by MOST and POSCO in Republic of Korea.
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