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<p>coupled <a href="page.php?w=Antiferromagnetism">antiferromagnetically</a>, by <a href="page.php?w=Gregory_Wannier">G. H. Wannier</a>, published in 1950. Related features occur in magnets with competing interactions, where both ferromagnetic as well as antiferromagnetic couplings between pairs of <a href="page.php?w=Spin_%28physics%29">spins</a> or magnetic moments are present, with the type of interaction depending on the separation distance of the spins. In that case <a href="page.php?w=commensurability_%28mathematics%29">commensurability</a>,</p><p>
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