Abstract
Combined addition of Ga and Co into Fe 3B-based NdFeB hard magnetic materials improves squareness of hysteresis loop and remanence. Since Ga addition is believed to reduce the grain size of the crystallites precipitated from the as-quenched amorphous state, fluorescence XAFS measurements of the Ga K-edge are carried out. A small change of XAFS spectrum for the as-quenched (amorphous) state just after the Fe 3B precipitation suggests that Ga is excluded from Fe 3B crystallites to surrounding amorphous region. Good agreement of the observed XAFS spectra for the annealed at a higher temperature where Nd 2Fe 14B is precipitated with the calculated CsCl-type CoGa alloy indicates a preferential bonding between Ga and Co.
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