Magnetic viewing film
Magnetic viewing film allows one to visualise magnetic fields easily. Of interest is the segmented field from the top magnet which is not apparent by just looking at it. The old AlNiCo bar magnet on the left has a very distorted field.
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Again detail can be seen not obvious to the eye. Fridge magnets have thin linear domains and use Halbach arrays to put most of the field on the “sticky side”. The top right one has been demagnetised in a diagonal stripe with a NIB magnet.
The bottom left checkerboard is a simple north/south alternating magnet array which I have used in a levitation of pyrolytic graphite project.
Phones have small magnets associated with the earpiece in front and speaker at the rear.
Above: The simple and ancient bar magnet of mine is presumably AlNiCo (Aluminium, Nickel, Cobalt). The irregular field shown in detail with magnetic viewing film. I wonder if I can re-magnetise it.
Above: The field after placing the magnet sideways (not lengthways) across the poles of a big electromagnet. Power was 37 v 20 A. The same view in iron filings is also shown. Note how the magnet poles are now on either side of the magnet rather than at the ends.
Related pages
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External links
Magnetic Field Viewing Film – Wikipedia
Photo Date: May 25, 2006