# Looking for image theory regarding magnetic elements.

1. Jun 4, 2013

### yungman

Question on Perfect Magnetic conductor.

Are PMC always metal compound like Iron etc. That has high $\mu$? So most of good magnetic conductor are themselves electric conductor?

PEC $\Rightarrow\;\hat n \times \vec E=0\;\hbox{ and }\;\hat n\times \vec H=\vec J$.
PMC $\Rightarrow\;\hat n \times \vec H=0\;\hbox{ and }\;\hat n\times \vec E=-\vec M$.

Is there anything else?

Thanks

Last edited: Jun 4, 2013
2. Jun 4, 2013

### the_emi_guy

High magnetic permeability does not imply good electrical conductivity. Magnetic core material that has high electrical resistivity is very desirable for high frequency transformers. Nickel zinc ferrites are an example, essentially insulators with resistivity > 10^5. The high resistivity prevents eddy current losses from spoiling high frequency operation.

3. Jun 4, 2013

### yungman

Thanks for the response. Yes, I understand there are material that are good magnetic conductor but not electric conductor. But there are quite a few that is both.