These include iron, nickel, cobalt, some alloys of rare earth metals, and some naturally occurring minerals such as lodestone. Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). An everyday example is a refrigerator magnet used to hold notes on a refrigerator door. A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, and attracts or repels other magnets. A magnet is a material or object that produces a magnetic field.
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