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• W2097147493 abstract "Very high magnetic field annealing is shown to affect the magnetic anisotropy in FeCo-base nanocrystalline soft ferromagnetic alloys. Alloys of composition Fe/sub 44.5/Co/sub 44.5/Zr/sub 7/B/sub 4/ were prepared by melt spinning into amorphous ribbons, then wound to form toroidal bobbin cores. One set of cores was crystallized in a zero field at 600/spl deg/C for 1 h, then, field annealed at 17 tesla (T) at 480/spl deg/C for 1 h. Another set was crystallized in a 17-T field at 480/spl deg/C for 1 h. Field orientation was transverse to the magnetic path of the toroidal cores. An induced anisotropy is indicated by a sheared hysteresis loop. Sensitive torque magnetometry measurements with a Si cantilever sensor indicated a strong, uniaxial, longitudinal easy axis in the zero-field-crystallized sample. The source is most likely magnetoelastic anisotropy, caused by the residual stress from nanocrystallization and the nonzero magnetostriction coefficient for this material. The magnetostrictive coefficient /spl lambda//sub s/ is measured to be 36 ppm by a strain gage technique. Field annealing reduces the magnitude of the induced anisotropy. Core loss measurements were made in the zero-field-crystallized, zero-field-crystallized-than-field-annealed, and field-crystallized states. Core loss is reduced 30%-50% (depending on frequency) by field annealing. X-ray diffraction reveals no evidence of crystalline texture or orientation that would cause the induced anisotropy. Diffusional pair ordering is thought to be the cause of the induced anisotropy. However, reannealing the samples in the absence of a magnetic field at 480/spl deg/C does not completely remove the induced anisotropy." @default.
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• W2097147493 date "2004-07-01" @default.
• W2097147493 modified "2023-10-16" @default.
• W2097147493 title "Induced Anisotropy in FeCo-Based Nanocrystalline Ferromagnetic Alloys (HITPERM) by Very High Field Annealing" @default.
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• W2097147493 doi "https://doi.org/10.1109/tmag.2004.832278" @default.
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