A new method has been developed for nondestructive testing of the property of magnetic fine powders.
It was found that the appreciate value was closely related to the property of the magnetic fine powders. Here, the appreciate value is defined as the peak value of the derivative of normalized impedance with frequency.
The following results were obtained:
(1) The appreciate value of the ferromagnetic, paramagnetic and diamagnetic powders are respectively, closely related to the magnetic susceptibility.
(2) The appreciate value for the mixture of binary powders is closely related to the composition of the mixture.
(3) The appreciate values increased with increase in the amount of powder packed in the vessel.