Anisotropic exchange interactions or tensorial exchange parameter

[flavianojs]

Dear all,

Does any of the branches of the Spirit repo have support for anisotropic exchange interaction of the type:

$$ J_{ij} \mathbf{S}_i \cdot \mathbf{S}_j \rightarrow J^x_{ij} S^x_{i} S^x_{j} + J^y_{ij} S^y_{i} S^y_{j} + J^z_{ij} S^z_{i} S^z_{j} $$

or yet a tensorial form

$$ J_{ij} \mathbf{S}_i \cdot \mathbf{S}_j \rightarrow \mathbf{S}_i \mathbf J_{ij} \mathbf S_j $$

where $\mathbf J_{ij}$ is now a matrix:

$$ \mathbf J_{ij} = \begin{pmatrix} J^{xx} & J^{xy} & J^{xz} \ J^{yx} & J^{yy} & J^{yz} \ J^{zx} & J^{zy} & J^{zz} \end{pmatrix} $$

which can encode both the symmetric and antisymmetric exchange interactions, such as the DMI?