system
Given the following post, respond as if you're commenting on Reddit:
human
[x-men] Do Magneto's powers shut down in heat via the Curie point of metals?

Magneto controls magnetic fields, so he can use them to affect matter that responds to them - moving metal, for example.

My understanding of magnetism includes the Curie point, discovered by Pierre Curie (husband of Marie Curie). The Curie point in a substance is when it's so hot that the magnetic properties of the particles it's made of vibrate enough that they're not aligned - their magnetic poles point in different directions from other particles, so the overall ability of the substance to respond to magnetism is negated.

By that logic, wouldn't fighting heat-based heroes (eg: Sunfire) distort the materials he's trying to affect with his powers?

Are there any scenes where that's been used to defeat him?
gpt
Depends on the version of magneto we are talking about.

At his absolute peak, he is basically a reality warper because he controls electrons themselves.

Most iterations allow him to control "metals" and his power being described as "magnetic manipulation" is just a way to describe his power and not the actual mechanism.

The few instances of "metal magnetism" magneto would not be able to if the metals were no longer magnetic.