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Preparation of new amorphous powder cores using Fe-based glassy alloy

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4 Author(s)
Yoshida, Shoji ; Central Res. Lab., Alps Electr. Co. Ltd., Nagaoka, Japan ; Mizushima, Takao ; Hatanai, T. ; Inoue, Akihisa

So as to obtain a new metallic powder core with constant permeability and low core loss up to higher frequency range, we have tried to prepare the amorphous alloy powder cores by using the Fe70 Al5Ga2P9.65C5.75B 4.6Si3 glassy alloy powders that have a wide supercooled liquid region (ΔTx) below the crystallization temperature (Tx). The Fe-based glassy alloy powder core (FGAPC) had a constant permeability of about 110 up to 10 MHz, which is comparable to commercial cores. The FGAPC also had a lowest core loss of 610 kW/m3 at Bm=0.1 T and f=100 kHz in any other metallic powder cores. These excellent magnetic properties of the FGAPC in a higher frequency range are presumably due to an extremely low coercive force (Hc) derived from sufficient elimination of internal stress by annealing at near the ΔTx and its higher electrical resistivity (ρ) of about 1.60 μΩm for the Fe70Al5Ga2 P9.65C5.75B4.6Si3 glassy alloy. These excellent magnetic properties of the FGAPC, therefore, allows us to expect that this core will be suitable for high frequency drive magnetic devices such as a choke coil, reactor and so on

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Magnetics, IEEE Transactions on  (Volume:36 ,  Issue: 5 )