The Naked Scientists Forum
Non Life Sciences
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06/06/2014 23:29:58 »
I was wondering if it is possible to make a capacitor out of steel magnetized foil or even better, neodymium foil
Would the magnetic field of the magnetic foil mess up how the 2 plates collect charge?
neodymium foil: 64ohm
Neilep Level Member
Re: Magnetic capacitor.
Reply #1 on:
07/06/2014 02:06:23 »
You want the plates of a capacitor to be as conductive as possible, so you minimise
in the capacitor, every time it charges & discharges.
Unfortunately, iron & neodymium are not very good conductors at DC. The
makes this resistivity higher at higher frequencies - but magnetic materials like iron & neodymium have a stronger skin effect than non-magnetic conductors like copper or aluminium.
The most common materials used for the plates of
are aluminum and tantalum. This is because of their ability to form a very thin insulating oxide layer which clings tightly to the metal surface, forming a stable insulating layer within the capacitor. Unfortunately, both iron and neodymium oxides flake off the surface, leaving a conductive path exposed, so these metals are not suitable for the plates of electrolytic capacitors.
make a plastic-insulated capacitor with magnetic plates, but this would suffer from the high-resistance effects mentioned earlier.