Capacitor with magnetic dielectric

AI Thread Summary
Using a soft magnetic material like ferrite as a dielectric in a parallel plate capacitor significantly affects its electrical characteristics. The relative permittivity of such a configuration is approximately 14, indicating that it would not perform well as a capacitor. Additionally, ferrite materials exhibit high loss at higher frequencies due to their partial conductivity. The discussion also raises questions about the specific types of ferrites with the lowest conductivity. Overall, incorporating magnetic dielectrics into capacitors can lead to reduced efficiency and increased losses.
Stephen03
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Odd question, would anybody know what would happen if a parallel plate capacitor (good conductor) had a soft magnetic material (fairly poor conductor) as a dielectric? What would be the DC/AC electrical characteristics of this?
 
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Stephen03 said:
Odd question, would anybody know what would happen if a parallel plate capacitor (good conductor) had a soft magnetic material (fairly poor conductor) as a dielectric? What would be the DC/AC electrical characteristics of this?

Welcome to the PF.

What are your thoughts? What would the effect on the value of the capacitance be? What would happen to the lossy characteristics of the capacitor? Why?
 
berkeman said:
Welcome to the PF.

What are your thoughts? What would the effect on the value of the capacitance be? What would happen to the lossy characteristics of the capacitor? Why?

Hi berkeman,
I have actually found an article that I wasn't able to find yesterday describing the permittivity of a capacitor with a ferrite as a dielectric. Here is the link (http://tdserver1.fnal.gov/tdlibry/TD-Notes/2007 Tech Notes/TD-07-014.pdf). The results were that the relative permittivity was close to 14. Assuming this fairly accurate with all ferrite materials, this wouldn't be that good of a capacitor. It is also fairly lossy at higher frequencies. This makes sense as ferrite materials are still somewhat conductive. Off the top of your head, what ferrite would you say has the lowest conductivity?
 

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