diamagnetism
Sign in to savethumb|Pyrolytic carbon has one of the largest diamagnetic constants of any room temperature material. Here a pyrolytic carbon sheet is levitated by its repulsion from the strong magnetic field of [[neodymium magnets]]
AI overview
Diamagnetism is a property of materials that causes them to be repelled by magnetic fields, which allows some substances like pyrolytic carbon to levitate when placed near strong magnets. It matters because it demonstrates a fundamental way that materials interact with magnetism and enables practical applications like magnetic levitation.
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Article
10 sectionsContents
- Materials
- Superconductors
- Demonstrations
- Curving water surfaces
- Theory
- Langevin diamagnetism
- In metals
- See also
- References
- External links
thumb|Pyrolytic carbon has one of the largest diamagnetic constants of any room temperature material. Here a pyrolytic carbon sheet is levitated by its repulsion from the strong magnetic field of [[neodymium magnets]]
Diamagnetism is the property of materials that are repelled by a magnetic field; an applied magnetic field creates an induced magnetic field in them in the opposite direction, causing a repulsive force. In contrast, paramagnetic and ferromagnetic materials are attracted by a magnetic field. Diamagnetism is a quantum mechanical effect that occurs in all materials; when it is the only contribution to the magnetism, the material is called diamagnetic. In paramagnetic and ferromagnetic substances, the weak diamagnetic force is overcome by the attractive force of magnetic dipoles in the material. The magnetic permeability of diamagnetic materials is less than the permeability of vacuum, μ0. In most materials, diamagnetism is a weak effect which can be detected only by sensitive laboratory instruments, but a superconductor acts as a strong diamagnet because it entirely expels any magnetic field from its interior (the Meissner effect).