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Does temperature affect the strength of a magnet

Yes, temperature affects the strength of a magnet. Colder temperatures will permit the magnetic field strength to increase a bit and hotter temperatures will decrease it a bit.
The effects can be demonstrated by a simple experiment with a bar magnet and a handful of carpet tacks. Freeze the magnet. Pick up some tacks. Take them off and count them. Record the data. Drop the magnet in boiling water. (And please be smart and safe about this part.) Use tongs to get it out and hold it with an oven mitt to pick up tacks again. Take them off and count them. Record the data. Compare the data. Repeat a few times. Compare the data from all runs. (Tacks work better than paper clips because they’re smaller and yield a bit more accuracy in an experiment. Iron filings are a mess; they cannot be counted and must be weighed.)
What happens at really high temperatures? There is a point called the Curie point or Curie temperature (Tc) at which the magnetic properties disappear altogether. This temperature varies from material to material as one could expect. The material’s magnetic domains are no longer “held in place” by the metallic crystal matrix when the Tc is exceeded. The atoms have too much kinetic energy and a random distribution of alignments of the domains will occur. Bye bye magnetism, hello paramagnetism.

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