Correction to: npj Computational Materials https://doi.org/10.1038/npjcompumats.2016.32, published online 14 October 2016

The original version of the published Article omitted the following statement from the Acknowledgements section: H.-F.Li. acknowledges the start-up research grant (Grant No. SRG2016-00091-FST) at the University of Macau and financial support from the Science and Technology Development Fund, Macau SAR (File Nos. 063/2016/A2 and 064/2016/A2). Additionally, Eq. (28) contains an error. The correct equation is as follows:

$$\begin{array}{ccccc}\\ E = - \,JM_0^2\cos (2\beta ) - \gamma M_0^2\cos \left( {\phi - \beta } \right)\cos \left( {\phi + \beta } \right)\cr \\ - DM_0^2\left[ {{\mathrm{cos}}^{\mathrm{2}}\left( {\phi - \beta } \right) + \cos ^2\left( {\phi + \beta } \right)} \right]\cr \\ - BM_0\left[ {\cos \left( {\phi - \beta } \right) - \cos \left( {\phi + \beta } \right)} \right]\cr \\ = - \,JM_0^2\cos (2\beta ) - \frac{{\gamma M_0^2}}{2}\left[ {\cos (2\phi ) + \cos (2\beta )} \right]\cr \\ - \,DM_0^2\left[ {1 + \cos (2\phi )\cos (2\beta )} \right]\cr \\ - \,2BM_0\sin \phi \sin \beta .\\ \end{array}$$