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

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 Al₅Ga₂P_9.65C_5.75B _4.6Si₃ glassy alloy powders that have a wide supercooled liquid region (ΔT_x) below the crystallization temperature (T_x). 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 B_m=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 (H_c) derived from sufficient elimination of internal stress by annealing at near the ΔT_x and its higher electrical resistivity (ρ) of about 1.60 μΩm for the Fe₇₀Al₅Ga₂ P_9.65C_5.75B_4.6Si₃ 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