Induced magnetic anisotropy in Si-free nanocrystalline soft magnetic materials: A transmission x-ray diffraction study

R. Parsons, T. Yanai, H. Kishimoto, A. Kato, M. Ohnuma, K. Suzuki

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In order to better understand the origin of field-induced anisotropy (Ku) in Si-free nanocrystalline soft magnetic alloys, the lattice spacing of the bcc-Fe phase in nanocrystalline Fe94xNb6Bx (x¼10, 12, 14) alloys annealed under an applied magnetic field has been investigated by X-ray diffraction in transmission geometry (t-XRD) with the diffraction vector parallel and perpendicular to the field direction. The saturation magnetostriction (ks) of nanocrystalline Fe94xNb6Bx was found to increase linearly with the volume fraction of the residual amorphous phase and is well described by taking into account the volume-weighted average of two local ks values for the bcc-Fe nanocrystallites (562 ppm) and the residual amorphous matrix (þ862 ppm). The lattice distortion required to produce the measured Ku values (100 J/m3) was estimated via the inverse magnetostrictive effect using the measured ks values and was compared to the lattice spacing estimations made by t-XRD. The lattice strain required to produce Ku under the magnetoelastic model was not observed by the t-XRD experiments and so the findings of this study suggest that the origin of magnetic field induced Ku cannot be explained through the magnetoelastic effect.
Original languageEnglish
Pages (from-to)1 - 4
Number of pages4
JournalJournal of Applied Physics
Issue number17
Publication statusPublished - 2015

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