Correction to: NPG Asia Materials

https://doi.org/10.1038/s41427-021-00347-3 published online 24 December 2021

In the sentence (page 5) beginning ‘by using the relation...’ in this article, the equation ‘\(\Delta S_M = \frac{1}{{\Delta T}}\left[ {{\int\nolimits_0^H} {\left( {M_1} \right)dH} {\int\nolimits_0^H} {\left( {M_2} \right)dH} } \right]\)’ should have read ‘\(\Delta S_M = \frac{1}{{\Delta T}}\left[ {{\int\nolimits_0^H} {\left( {M_1} \right)dH} - {\int\nolimits_0^H} {\left( {M_2} \right)dH} } \right]\)’.

The original article has been corrected.