SynopsisPowder compressed magnetic cores are widely used in smoothing choke coils of switching regulators. These cores are mostly made by castcrushed Fe-Si-Al powder and there are little reports on the cores made by atomized powder. Magnetic properties of the cores were investigated with atomized Fe-Si-Al powder made under several conditions.High permeability was observed in the water-atomized powder cores , in which the effective demagnetizing factor N of the core might be decreased because of the contact between the powders of irregular shape. Resistivity of gas-atomized powder core was higher than that of water-atomized powder core. The reason was understood that electrical insulation between the powders was kept because of the smooth surface of the gas-atomized powder compared with the irregular shaped water-atomized powder.Furthermore core loss was almost constant above the critical resistivity of about 0.03 m ,and it has large dependence below the resistivity. The critical resistivity was thought to be determined by change of the path of
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