Neodymium rare earth magnets (NdFeb) vary in shape and size, and the different shapes each have their own corresponding magnetization direction patterns.
All Neodymium magnets have both a north and south pole.
Becoming familiar with the magnetization direction of your magnets will help you determine which one is best for your project and which way it should be oriented so that it works most effectively.
Note that a magnet is strongest when one of its poles is touching the opposing surface. For example, an axially magnetized disc/ring magnet will work best when one of its fl at faces is flush against the flat opposite-polarity side of another disc or ring magnet.
Disc magnets can be either axially magnetized or diametrically magnetized. Axially magnetized disc magnets have the north and south poles on the large flat surfaces, while diametrically magnetized disc magnets have the north and south poles on the rounded sides.
Likewise, ring magnets can be either axially magnetized or diametrically magnetized. That is, axially magnetized ring magnets have the north and south poles on the flat surfaces, while diametrically magnetized ring magnets have the north and south poles on the rounded side.
Neodymium ring magnet is circular in shape with a hollow center. Besides the conventional axial magnetizing or diametrically magnetizing ring magnets, radially oriented ring magnet (uni-pole magnetized magnet) is also available.
Note: Neodymium ring magnets are easy to corrode under humid environment and are necessary to cover with a protective coating.
⇲ Main Reference Source https://totalelement.com/blogs/about-neodymium-magnets/neodymium-magnetization-direction
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