Abstract
The field-induced magnetic anisotropy (Ku) and the hyperfine interactions in nanocrystalline Fe94−xNb6Bx (x=10, 12, and 14) alloys have been investigated with particular attention paid to the origin of Ku in the bcc-Fe/amorphous soft magnetic nanostructures. The Fe57 Mössbauer spectra from the Fe–Nb–B alloys suggest that the solute content in the residual amorphous phase remains unchanged while the volume fraction of the residual amorphous phase (Vam), increases linearly with B content. This indicates that Vam is governed by the lever rule over the partial equilibrium between the primary bcc-Fe and the residual amorphous phases. Both the saturation magnetization (Js) and Ku were confirmed to vary linearly with Vam and they are well described by taking into account the volume-weighted average of Js=2.1T and Ku=127J∕m3 for the bcc-Fe nanocrystallites and Js=1.0T and Ku=76J∕m3 for the residual amorphous matrix. The relatively large Ku value estimated for the bcc nanocrystallites may be attributed to a possible local tetragonal distortion induced by the interstitial B atoms.
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