Permeability vs. Temperature

[fredrider]

I am looking for a ferromagnetic material that decreases its permeability as the temperature rises. A 20% to 30% decrease between -20C and 180C would be ideal. Does anybody know of such a material?

 

[nbucska]

It is even possible to manufacture ferrit with predictable Curie-point. <nbucska@pcperipherals.com>