(Fe2O3) Ferrite, or known as magnet.

(Fe2O3) Ferrite, or known as magnet.

The term alnico is derived from the names of three metals, aluminum, nickel, and cobalt, which can be used to make an alloy that has useful magnetic properties. Ferrite is a form of iron. Alnico magnets are more powerful and more expensive than ferrite magnets.

The term "refrigerator magnet" is ambiguous and may refer to any number of types of magnets. However, typically a refrigerator magnet is going to be relatively weak and made of the most inexpensive materials available. Hard refrigerator magnets are likely iron. Flexible refrigerator magnets are made of bonded ferrite powders; barium ferrite is among the most common.

In general classification, a refrigerator magnet is a permanent magnet.

A good magnet should do the trick. Neodymium-Ferrite-Boron magnets are a good candidate.