Are Magnets Affected by Temperature?
Demagnetise a Magnet, Methods of Demagnitising a Permanent Magnet
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How to Demagnetize a Magnet: A Complete Guide
Why does heating a magnet or dropping a magnet on a hard surface weaken its magnetism? - Quora
How Can A Magnet Be Demagnetized Quickly? » Science ABC
How Does Heat Affect Magnets?
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How to demagnetise a magnet
Demagnetization
How do you re-magnetize a magnet?