ferromagnetid

Ferromagnetism is a phenomenon by which certain materials can form permanent magnets, or are attracted to magnets. It is the strongest type of magnetism. Ferromagnetic materials are strongly attracted to magnetic fields and can be magnetized themselves. This is due to the presence of unpaired electrons and the way these electrons interact with each other, forming magnetic domains. Within these domains, the magnetic moments of the atoms are aligned in the same direction. When an external magnetic field is applied, these domains can align with the field, causing the material to become magnetized. When the external field is removed, some or all of this alignment may persist, resulting in a permanent magnet. Common ferromagnetic materials include iron, nickel, cobalt, and their alloys. The Curie temperature is a critical temperature above which a ferromagnetic material loses its ferromagnetism and becomes paramagnetic. This property is fundamental to many technologies, including electric motors, generators, data storage, and magnetic resonance imaging.