Nonmagnetic materials are either paramagnetic (oxygen, aluminium, tungsten, platinum) or diamagnetic (silver, lead, water, graphite). These materials are nonmagnetic because when putting them into magnetic fields the orientation of magnetic domains (or magnetic centers) inside the material does not coincide with the direction of the external magnetic field. The magnetic moments inside the material are located chaotically even when being in a magnetic field. If ferromagnetics amplifies the external magnetic field, paramagnetic materials have it approximately the same as the external magnetic field, and diamagnetic materials make the field inside them weaker than the external magnetic field. All these features are related to the specific atomic/molecular structures of materials and their different magnetic moments.
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