Restoring the magnetic-flux of a magnet

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Restoring the magnetic flux of a horseshoe magnet that has lost its magnetism can be challenging, especially if it was improperly demagnetized instead of remagnetized. A keeper plate is essential after remagnetization to maintain the magnet's strength. Users are seeking reliable sources or methods for effectively remagnetizing their magnets. The specific dimensions of the magnet are noted, which may influence the choice of remagnetization techniques. Finding a professional service or using a strong external magnetic field are potential solutions for restoring the magnet's properties.
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How do you go about restoring the magnetic-flux of a horseshoe magnet that has lost all its' magnetic-flux? The magnet was originally weak and was sent to a company to have the magnetisim restored and when returned, all magnetic-flux was gone, as if it had been degaussed.
 
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They demagnetized it instead of remagnetized it.

It needs to have a keeper plate on it after being remangetized.
 
Thankyou for the information. What source is there for remagnitizing a magent? The horseshoe magnet measures 2 3/4" H X 2 1/2" W X 1" X 3/8" thick.
 
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