Magnetic Fields, Rotating Atoms and the Origin of Diamagnetism

Authors: Essén, H.
Document Type: Article
Pubstate: Published
Journal: Physica Scripta
Volume: 40   761-767
Year: 1989


A qualitative difference between the electric and magnetic responses of matter to external fields is pointed out and is explained as being due to the different nature of the corresponding microscopic dipoles. The classical explanation of diamagnetism is reviewed and elaborated. Various approaches to Larmor's theorem are discussed. Some results of Marsh concerning the magnetic field of rotating charge distributions are extended and applied to the problem. The Langevin formula for diamagnetic susceptibility is arrived at as well as a formula for the induced field at the nucleus. The general theorem that the field outside a spherical multipole density is a pure multipole field is presented.