Molecular spin alignment having macro torque effects?

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SUMMARY

The discussion centers on the relationship between molecular spin alignment and macro torque effects, specifically referencing the Einstein-de Haas effect and the Barnett effect. The Einstein-de Haas effect describes how aligning electron or nuclear spins in a magnetic field can induce torque, causing a fixed rod to rotate. Conversely, the Barnett effect explains how mechanical rotation of a ferromagnetic body leads to magnetization along its rotational axis. These phenomena illustrate the interplay between magnetism and mechanical motion.

PREREQUISITES
  • Understanding of the Einstein-de Haas effect
  • Familiarity with the Barnett effect
  • Basic knowledge of electron and nuclear spins
  • Concepts of magnetism and torque in physics
NEXT STEPS
  • Research the Einstein-de Haas effect in detail
  • Explore the Barnett effect and its applications
  • Study the principles of electron and nuclear spin alignment
  • Investigate the relationship between magnetism and mechanical systems
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Physicists, engineers, and researchers interested in the effects of magnetism on mechanical systems, particularly those studying spintronics and magnetic materials.

xerxes73
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Hello,

If a magnetic field aligns the electron or nuclear spins can that have a macro effect of causing torque? So for example if we had a rod and we fixed one end but allowed it to freely rotate and then aligned electron or nuclear spins would that cause the rod to rotate?

Thanks,
Xerxes73
 
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And the opposite effect is the Barnett effect, whereby mechanical rotation of a ferromagnetic body on its axis results in magnetization along the rotational axis.

http://prola.aps.org/abstract/PR/v6/i4/p239_1

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Last edited:
Thanks! I appreciate the info. This led to some interesting reading. -Xerxes73
 

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