Magnetic capacitor.

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Offline ScientificSorcerer

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Magnetic capacitor.
« on: 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
http://www.sigmaaldrich.com/catalog/product/aldrich/693758?lang=en&region=US

steel foil:12ohm
http://www.zoro.com/g/00101288/k-G2209681?utm_source=google_shopping&utm_medium=cpc&utm_campaign=Google_Shopping_Feed&gclid=CLXE47Oo5r4CFcHm7AodS1gA7Q

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Offline evan_au

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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 resistive losses in the capacitor, every time it charges & discharges.

Unfortunately, iron & neodymium are not very good conductors at DC. The skin effect 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 electrolytic capacitors 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.

You could make a plastic-insulated capacitor with magnetic plates, but this would suffer from the high-resistance effects mentioned earlier.