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According to Wikipedia, when the material reaches Curie Temperature. This temperature is different for each marerial .
Iron 770 degrees, Cobalt 1130, Nickel 358, Iron Oxide 622.
Material will lose it's magnetism at these temp.
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I believe it is called the 'curie point', and is different depending on the metal. ex: Iron loses it's magnatism at 770 degrees celcius while cobolt loses its magnatism at 1130 degrees celcius.
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