Magnetic properties of 120-mm wide ribbons of high Bs and low core-loss NANOMET® alloy

A 120-mm wide amorphous ribbon of a Fe-Co-Si-B-P-Cu NANOMET® alloy has been successfully produced by a single roll melt spinning technique. The optimally annealed samples exhibited low coercivity (Hc) of 5–7 A/m and high saturation magnetic flux density (Bs) of 1.83 T. The plots of Hc and Bs vs. ann...

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Bibliographic Details
Published in:Journal of applied physics 2015-05, Vol.117 (17)
Main Authors: Setyawan, Albertus D, Takenaka Kana, Sharma Parmanand, Nishijima Masahiko, Nishiyama Nobuyuki
Format: Article
Language:eng ; jpn
Subjects:
Annealing
Coercivity
Controllability
Core loss
Flux density
Magnetic flux
Magnetic properties
Magnetism
Melt spinning
Nanocrystals
Optimization
Reproducibility
Softness
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Summary:A 120-mm wide amorphous ribbon of a Fe-Co-Si-B-P-Cu NANOMET® alloy has been successfully produced by a single roll melt spinning technique. The optimally annealed samples exhibited low coercivity (Hc) of 5–7 A/m and high saturation magnetic flux density (Bs) of 1.83 T. The plots of Hc and Bs vs. annealing temperature (Ta) revealed basin-like and plateau-like characteristics, respectively, indicating the good annealing controllability for nanocrystallization and for obtaining soft-magnetic properties with high Bs. The excellent magnetic softness was attributed to the nanocrystalline structure composed of homogeneously dispersed α-Fe grains (with a size of 15–20 nm in diameter) emerged from the amorphous structure after optimum annealing. The nanocrystalline ribbons also exhibited low core-losses (W at 50 Hz) of 0.37 and 0.64 W/kg under maximum flux density of 1.5 T and 1.7 T, respectively. The magnetic properties were comparable with those of laboratory-scale small-width ribbons and confirmed to be independent on the ribbon width, indicating the good reproducibility of this NANOMET® alloy into mass-production-level precursors.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4913936