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Spin canting

Spin canting
Antisymmetric exchange would align spins perpendicular to each other

Some antiferromagnetic materials exhibit a non-zero magnetic moment at a temperature near absolute zero. This effect is ascribed to spin canting, a phenomenon through which spins are tilted by a small angle about their axis rather than being exactly co-parallel.

Spin canting is due to two factors contrasting each other: isotropic exchange would align the spins exactly antiparallel, while antisymmetric exchange arising from relativistic effects (spin–orbit coupling) would align the spins at 90° to each other. The net result is a small perturbation, the extent of which depends on the relative strength of these effects.

This effect is observable in many materials such as hematite.

References

References

  1. Richard Winpenny. (2011). "Molecular Cluster Magnets". World Scientific.
  2. "Ferromagnetism". University of California, San Diego.
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