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What are the parts of a basic
magnetic disc?

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Parts of a basic magnetic disc: north pole and south pole

Magnetic poles on a basic magnet disc

Axially, diametrically and multipole magnetic discs The magnetic poles of a basic magnetic disc can be magnetised in three ways: axially, diametrically, and multi-pole. There are three varieties of magnetisation available that allow the magnets to be employed in a number of ways. The most common form available is the axially magnetised magnetic disc.
Axially and diametrically magnetised disc magnets with labelled north and south poles

Axially and diametrically magnetised

An axially magnetised basic magnetic disc is magnetised through the length of the magnet, whereas a diametrically magnetised basic magnetic disc is magnetised through the diameter.

Axially magnetised magnetic disc The different types of magnetisation allow the magnets to hold onto ferromagnetic surfaces in different ways. Axially magnetised magnetic discs will attract ferromagnetic materials from its large circular surface.
Magnetic earrings with labelled north and south poles They can be used as magnetic clasps due to the need to have the entire north pole on one magnetic face to hold the magnet clasp together, for example a pair of magnetic earrings.
Magnet therapy bracelet with a diametrically magnetised magnetic disc, with labelled north and south poles A diametrically magnetised magnetic disc, on the other hand, will attract ferromagnetic materials from the side. This is particularly useful for a magnet therapy bracelet as it allows the user to wear the bracelet in different ways without losing any of the magnet’s benefits e.g. the north pole will always be touching the skin.
Multipole magnetic disc with labelled north and south pole

Multi-pole magnetised

A multi-pole basic magnetic disc is where only one face of the magnetic disc has been magnetised. This face is magnetised in a striped pattern of north and south poles e.g.  north, south, north, south, north.

Placing adhesive backed magnetic disc onto wall A multi-pole magnetisation is generally used on magnetic discs where an adhesive is placed on the back. This is because the multi-pole magnetisation allows both the north and south poles to be on one magnetic face to attract a ferromagnetic surface. This would not occur with the adhesive on the back blocking the magnetic field if the magnet had been magnetised axially or diametrically.

Magnet disc adhesive

three 3M adhesive backed basic magnetic discs Basic magnetic discs are available with a hi tack adhesive on one of the magnetic faces. Hi tack adhesives are glues made of polyethylene which can be used to attach a basic magnetic disc to non-ferromagnetic materials such as wood. This is useful for attaching magnets to cabinet doors.

Magnet disc keeper

Basic magnetic discs with keepers in between The steel keeper on a countersunk magnetic disc must be removed before use to allow the magnet to work to its full potential.
Wonkee donkee says "A keeper, also known as a shunt, is a soft iron piece temporarily added between the north and south poles of the magnet to prevent it from demagnetising"

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