The Lorentz Field in an Antiferromagnet

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Abstract
It is shown that in a multiple sublattice spin system the Lorentz field associated with one sublattice exerts a torque on the other sublattices. In the case of uniform precession, this modifies the demagnetization field thereby altering the resonant frequency. It is also shown that spin waves produce a Lorentz field which shifts the spin‐wave manifold.