The graph 'Stalled progress' in the News Feature 'The pull of stronger magnets' ( Nature 472, 22–23; 2011) incorrectly labelled one line as samarium–iron–nickel. This should have read samarium–iron–nitrogen.
The online version of the original article can be found at 10.1038/472022a
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Correction. Nature 473, 19 (2011). https://doi.org/10.1038/473019b