why the magnet is demagnetized when heated.?

Answer 1

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Above the curie temperature the phase of the metals making up the magnet is changed.

The magnetic moments are aligned in a magnet to constructively contribute to the overall magnetisation. When heated, these magnetic moments oscillate. After a certain temperature, the magnetic moments are oscillating so much that they do not align and destructively contribute, destroying the magnetisation.

Answer 2

Unless you are talking about some very extreme temperatures, heat does not actually demagnetize. The magnetic properties subside during periods of higher temperatures, and then return when the magnet cools down.

Today, almost no magnets are made of metal.

Source(s): http://signalsorcerer.com/

Answer 3

heating destroys the alignment of domains in a magnetic material

due to which the material loses magnetism

Answer 4

i think of the warmth power distores the magnetic field because of the fact the magnet heats up the sector get weaker and weaker finally demagnetising the magnet. power has to flow someplace as you be attentive to it could't be created nor destroyed.