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Magnet - How to demagnetize materials | | Magnet - How to demagnetize materials: Encyclopedia II - Magnet - How to demagnetize materials | | Permanent magnets can be demagnetized in the following ways:
Heat. Heating a magnet past its Curie point will destroy the long range ordering.
Contact. Stroking one magnet with another in random fashion will demagnetize the magnet being stroked, in some cases; some materials have a very high coercive field and cannot be demagnetized with other permanent magnets.
Hammering or jarring. Such activity will destroy the long range ordering within the magnet.
Being placed in a solenoid which has an alternatin ...
See also:Magnet, Magnet - Introduction, Magnet - Physical origin of magnetism, Magnet - Permanent magnets, Magnet - Electromagnets, Magnet - Characteristics of magnetic materials, Magnet - Permanent magnets and dipoles, Magnet - North/south pole designation and the Earth's magnetic field, Magnet - Common uses for magnets, Magnet - How to magnetize materials, Magnet - How to demagnetize materials, Magnet - Types of permanent magnets, Magnet - Magnetic forces, Magnet - Magnets and other magnets, Magnet - Magnets and ferromagnetic materials, Magnet - Magnets and diamagnetic materials, Magnet - Magnets and paramagnetic materials, Magnet - Calculating the magnetic force, Magnet - Online references, Magnet - Printed references, Magnet - External articles | | | Magnet, Magnet - Calculating the magnetic force, Magnet - Characteristics of magnetic materials, Magnet - Common uses for magnets, Magnet - Electromagnets, Magnet - External articles, Magnet - How to demagnetize materials, Magnet - How to magnetize materials, Magnet - Introduction, Magnet - Magnetic forces, Magnet - Magnets and diamagnetic materials, Magnet - Magnets and ferromagnetic materials, Magnet - Magnets and other magnets, Magnet - Magnets and paramagnetic materials, Magnet - North/south pole designation and the Earth's magnetic field, Magnet - Online references, Magnet - Permanent magnets, Magnet - Permanent magnets and dipoles, Magnet - Physical origin of magnetism, Magnet - Printed references, Magnet - Types of permanent magnets, electromagnet, electromagnetism, electromagnetic field, neodymium magnet, diamagnetism, magnetic dipole, magnetic monopole, magnetism, molecular magnet, paramagnetism, single-molecule magnet | | |
| | | Magnet: Encyclopedia II - Magnet - How to demagnetize materials
Magnet - How to demagnetize materials
Permanent magnets can be demagnetized in the following ways:
- Heat. Heating a magnet past its Curie point will destroy the long range ordering.
- Contact. Stroking one magnet with another in random fashion will demagnetize the magnet being stroked, in some cases; some materials have a very high coercive field and cannot be demagnetized with other permanent magnets.
- Hammering or jarring. Such activity will destroy the long range ordering within the magnet.
- Being placed in a solenoid which has an alternating current being passed through it. The alternating current will disrupt the long range ordering, in much the same way that direct current can cause ordering.
In an electromagnet, ceasing the flow of current will eliminate the magnetic field. However, a slight field may remain in the core material as a result of hysteresis.
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 Adapted from the Wikipedia article "How to demagnetize materials", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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