Dear all,

May I ask if a material over the Curie Temperature is able to generate a magnetic field?

Over the  Curie Temperature the material is paramagnetic, magnetically disordered...

In another words, if the Earth core is 4400 °C  to 6100 °C,  and the Curie temperature is important for magnetic properties, may I ask if it is possible that the Earth  magnetic field is generated from the Earth core?

Thank you for your time.

Yes, it can. Just not as a ferromagnet. Current flow also gives rise to magnetic fields, which is how the core is thought to do it.

17 minutes ago, swansont said:

Yes, it can. Just not as a ferromagnet. Current flow also gives rise to magnetic fields, which is how the core is thought to do it.

Yup +1.

 

Just like to add to this that the Curie temperature is specific to a pure substance.

So mixtures such as the Earth's core will not display one definite CT.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5216106/

This also shows just how far above CT the core temperature is.

Edited October 12, 20178 yr by studiot

A current flow of ions...

May I say that we have plasma in the Earth Core? not solid, not liquid, but plasma.

Like a less bright sun?

31 minutes ago, Doubt said:

A current flow of ions...

May I say that we have plasma in the Earth Core? not solid, not liquid, but plasma.

Like a less bright sun?

I don't think the core counts as a plasma.

1 hour ago, Doubt said:

A current flow of ions...

May I say that we have plasma in the Earth Core? not solid, not liquid, but plasma.

Like a less bright sun?

The most recent measurements and hypotheses place the Earths core as being at least as hot as the surface of the Sun.

This is consistent with modern hypotheses that require more than radioactive augmentation to account for the cooling rate and present temperature of the Earth.

Yet whilst the Sun is plasma, the core is not since it is not gaseous as the pressure is too high.