Opener Magnet
Posted September 17, 2008
By admin
Is it possible to demagnatize a magnet?
I am trying to hang a key box on the wall but the magnet inside of the unit is so strong that when I want to open the key box the whole container gets yanked off the wall. Any advice?
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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Types of permanent
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