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See related link about magnetic materials. Magnetic fields are caused by moving electrons. Most atoms or molecules will have an electron spinning in one direction, paired with another electron spinning in the opposite direction. The tiny magnetic fields created by each spinning electron cancel each other out when they are paired like this.

Materials which attract to magnets have atoms with an electron that is not paired, and each atom will act like a tiny magnet. If you get enough of these tiny magnets pointing in the same direction, the material will act like a magnet. In some materials, the atoms will align themselves with an external magnetic field, creating a field with an attractive force to the external field. When the external field is removed, the atomic magnets may return to the previous state, or if enough of them remain pointing in the same direction, then the material becomes magnetized.

Plastic magnets, such as "kids" letters have a magnet, encased in plastic.

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