permanent magnetic moment

A permanent magnetic moment refers to a persistent magnetic field produced by a material, even in the absence of an external magnetic field. This phenomenon is primarily associated with ferromagnetic materials like iron, nickel, and cobalt.123

The magnetic moment of an atom originates from the motion and spin of its electrons. In ferromagnetic substances, these atomic magnetic moments spontaneously align within regions called domains. When these domains are oriented in the same direction, they reinforce each other, creating a net macroscopic magnetic field. This alignment can be permanent, allowing the material to function as a magnet. Materials that are not ferromagnetic, such as diamagnetic and paramagnetic substances, exhibit weaker magnetic properties that are often temporary or dependent on external fields.456273