ferromagnetism

thumb|A magnet made of [[alnico, a ferromagnetic iron alloy, with its keeper]] thumb|Paramagnetism, ferromagnetism, and spin waves Ferromagnetism is a property of certain materials (such as iron) that results in a significant, observable magnetic permeability, and in many cases, a significant magnetic coercivity, allowing the material to form a permanent magnet. Ferromagnetic materials are noticeably attracted to a magnet, which is a consequence of their substantial magnetic permeability.

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Ferromagnetism is a property of certain materials like iron that makes them strongly magnetic and able to become permanent magnets. This matters because ferromagnetic materials are powerfully attracted to magnets and retain their own magnetism, making them useful for countless everyday applications from refrigerator magnets to electric motors.

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Article

13 sections

Contents

Terms
Unusual materials
Electrically induced ferromagnetism
Explanation
Origin of atomic magnetism
Exchange interaction
Magnetic anisotropy
Magnetic domains
Magnetized materials
Curie temperature
See also
References
External links

Magnetic permeability describes the induced magnetization of a material due to the presence of an external magnetic field. For example, this temporary magnetization inside a steel plate accounts for the plate's attraction to a magnet. Whether or not that steel plate then acquires permanent magnetization depends on both the strength of the applied field and on the coercivity of that particular piece of steel (which varies with the steel's chemical composition and any heat treatment it may have undergone).