A molecular magnet comprising cobalt(II) ions and nitronyl-nitroxide radicals has a large coercivity at low temperature that makes it comparable to the hardest commercial alloy-based magnets. The one-dimensional character of the material, with very strong and anisotropic exchange interactions along the chains, seems responsible for the dramatic slowing of the magnetization dynamics.
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Roberta Sessoli (2008) studied this question.
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