Weight changes under strong, uniform magnetic fields?

[hkyriazi]

Has anyone ever looked for reversible weight changes while materials are subjected to uniform, strong magnetic fields, such as those involved in nuclear magnetic resonance imaging (MRI) or spectroscopy? I suspect no one ever has, for lack of a reason, and any such effects would have to be subtle, else someone would have noticed by now.

 

[Bystander]

https://en.wikipedia.org/wiki/Gouy_balance

 

[hkyriazi]

Interesting info. Are the magnetic fields typically employed here strong enough to cause nucleons in the atomic nuclei to line up (as in NMR/MRI), rather than just the atoms' electrons?