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

In order to better understand the origin of field-induced anisotropy (K{sub u}) in Si-free nanocrystalline soft magnetic alloys, the lattice spacing of the bcc-Fe phase in nanocrystalline Fe{sub 94−x}Nb{sub 6}B{sub x} (x = 10, 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 (λ{sub s}) of nanocrystalline Fe{sub 94−x}Nb{sub 6}B{sub x} 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 λ{sub s} values for the bcc-Fe nanocrystallites (−5 ± 2 ppm) and the residual amorphous matrix (+8 ± 2 ppm). The lattice distortion required to produce the measured K{sub u} values (∼100 J/m{sup 3}) was estimated via the inverse magnetostrictive effect using the measured λ{sub s} values and was compared to the lattice spacing estimations made by t-XRD. The lattice strain required to produce K{sub u} 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 K{sub u} cannot be explained through the magnetoelastic effect.
Authors:
;  [1] ;  [2] ; ;  [3] ;  [4]
  1. Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800 (Australia)
  2. Graduate School of Engineering, Nagasaki University, Nagasaki 852-8521 (Japan)
  3. Toyota Motor Corporation, Mishuku, Susono, Shizuoka 410-1193 (Japan)
  4. Faculty and Graduate School of Engineering, Hokkaido University, Sapporo 060-8628 (Japan)
Publication Date:
OSTI Identifier:
22403028
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AMORPHOUS STATE; ANISOTROPY; BCC LATTICES; BORON ALLOYS; COMPARATIVE EVALUATIONS; CRYSTALS; IRON BASE ALLOYS; MAGNETIC FIELDS; MAGNETIC MATERIALS; MAGNETOSTRICTION; NANOSTRUCTURES; NIOBIUM ALLOYS; STRAINS; X-RAY DIFFRACTION