Question
Question: Is it true that heat demagnetizes magnets? I don't understand how the earth's core can be magnetized if it is so hot. And, how is the core solid if it is so hot. Shouldn't it be a liquid? Thank you.
Answer
Heat can damage or reduce the magnetization of bar magnets. As you heat a magnet the atoms move more rapidly and randomly disrupting the magnetic domains.
The Earth's core - a region of iron alloys - consists of a liquid outer core and a solid inner core. Earth's geomagnetic field stems from moving currents in the liquid outer core. The geomagnetic strengthens and wanes and reverses direction.
This model shows the physical relationship between the solid inner core and the liquid outer core. The enormous pressure on the inner core prevents it from becoming a liquid.