Fluid that is a permanent magnet at room temperature?

AI Thread Summary
No known fluid can act as a permanent magnet at room temperature, as the random orientation of magnetic moments in fluids prevents the formation of a stable magnetic field. Ferrofluids, while magnetic, only exhibit temporary magnetism and do not retain their magnetic properties once the external field is removed. The discussion highlights the fundamental limitations of fluid dynamics in achieving permanent magnetism. The consensus is that the nature of fluids inherently negates the possibility of them being permanent magnets. Therefore, a permanent magnetic fluid does not currently exist.
ryanuser
Messages
74
Reaction score
0
Hi
Is there any fluid that is a permanent magnet at room temperature? (Ferrofluids do not retain their magnetic effect hence temporary).
Thanks
 
Last edited by a moderator:
Physics news on Phys.org
ryanuser said:
Hi
Is there any fluid that is a permanent magnet at room temperature? (Ferrofluids do not retain their magnetic effect hence temporary).
Thanks

HI I couldn't imagine or know of any fluid that could be a permanent magnet at any temperature
The continuous random orientation of the magnet moments of the particles in a fluid would negate
the possibility of an orderly magnetic field being formed

Dave
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'
So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
Back
Top