Magnetic inconsistency occurs in ferrite, which is manifested by a decrease in magnetic permeability that occurs after the core is demagnetized. This demagnetization occurs after the operating temperature is higher than the Curie point temperature, and is applied to an alternating current or mechanical vibration that gradually decreases the amplitude.
In this phenomenon, the magnetic permeability first increases to its original level and then decreases exponentially. If no special conditions are desired for the application, then the change in magnetic permeability will be smaller, as many changes will change within a few months after production. High temperatures accelerate this reduction in magnetic permeability. Magnetic inconsistency will repeat after each successful demagnetization, it is different from aging.