Hi
Ferrites change permeability with flux and temperature.
For an application where we need long term stability I need to know how the permeability change with time. A short term effect called disaccomodation changes the permeability due to mechanical, temperature or magnetic shock.
But, do any of you know of a long time effect? Permeability change over a number of years, perhaps due to thermal cycling?
This reference shows something in the figure 15.2 page 28:
Thanks
Klaus