Spherical magnet spins due to a rolling force and defies gravity!

[broli]

I came across this very interesting paper:


Spin revolution breaks time reversal symmetry of rolling magnets | Scientific Reports (nature.com)


Which shows a very interesting effect I havent seen discussed before. When a spherical magnet is allowed to roll it causes it to spin due a combination of the Barnett effect and gyroscopic precession/damping. This seems to break symmetry as in this paper they show how it can lift up against gravity. I just ordered some spherical magnets to play around this effect.


Here are the related videos:
https://static-content.springer.com/esm/art%3A10.1038%2Fs41598-022-17766-z/MediaObjects/41598_2022_17766_MOESM1_ESM.mov
https://static-content.springer.com/esm/art%3A10.1038%2Fs41598-022-17766-z/MediaObjects/41598_2022_17766_MOESM2_ESM.mov
https://static-content.springer.com/esm/art%3A10.1038%2Fs41598-022-17766-z/MediaObjects/41598_2022_17766_MOESM3_ESM.mov
https://static-content.springer.com/esm/art%3A10.1038%2Fs41598-022-17766-z/MediaObjects/41598_2022_17766_MOESM4_ESM.mov
https://static-content.springer.com/esm/art%3A10.1038%2Fs41598-022-17766-z/MediaObjects/41598_2022_17766_MOESM5_ESM.mov
https://static-content.springer.com/esm/art%3A10.1038%2Fs41598-022-17766-z/MediaObjects/41598_2022_17766_MOESM6_ESM.mov

[Jimboot]

They could just be attracted to the Fe in nearby objects. Screws in the furniture etc. I have 3 spherical neos of varying diameters they roll very easily on a bench if iron is nearby. Not sure if its Al or Fe in the clip but either would be having an affect at that distance I would have thought. They way the magnet wants to roll towards something when first on the bench indicates it is being attracted to something. Surely they would have checked that but can't see in in the paper. I can see a particle board bench which typically would have screws in it. They may be right but the vids are not convincing.

[alan]

This is somewhat related. 
https://www.researchgate.net/publication/338593391_Tutorial_on_Electromagnetic_Nonreciprocity_and_Its_Origins 
Interesting stuff,  thanks for sharing.

[broli]

They could just be attracted to the Fe in nearby objects. Screws in the furniture etc. I have 3 spherical neos of varying diameters they roll very easily on a bench if iron is nearby. Not sure if its Al or Fe in the clip but either would be having an affect at that distance I would have thought. They way the magnet wants to roll towards something when first on the bench indicates it is being attracted to something. Surely they would have checked that but can't see in in the paper. I can see a particle board bench which typically would have screws in it. They may be right but the vids are not convincing.

This seems like a very simple thing to rule out. Especially when the magnets are rising in a glass tube. What metal object would be attracting them, the ceiling?

[Jimboot]

This seems like a very simple thing to rule out. Especially when the magnets are rising in a glass tube. What metal object would be attracting them, the ceiling?

I hope they're right because it would be interesting to explore. The stand that hold the tube looks like it could be some metal involved. If it was just plastic and ceramic then great.