Si

The combination of the uniform exchange (J) and the Dzyalloshinskii-Moria interaction (D) are fundamental interactions that produce the twisted magnetic structures, helices and skyrmion lattices, in B20 structured compounds such as MnSi. However, it is still not clear which parameter or parameters primarily control these interactions and which model of magnetism is suitable for describing MnSi. To compare the effect of increased spin-orbit interaction and the increased valance electron density on the magnetic behavior of MnSi, we explored the effect of iridium doping in MnSi, Mn_1-xIr_xSi [1], and compared our results to similar studies on Mn_1-x(Fe,Co)_xSi. The similarity of the behavior of Mn_1-xIr_xSi and Mn_1-xCo_xSi as observed in our magnetization and small angle neutron scattering measurements indicate that the electronic structure surprisingly controls the magnetic behavior of this system.
References:
Dhital, Chetan, et al. "Exploring the origins of the Dzyalloshinski-Moria interaction in MnSi." arXiv preprint arXiv:1707.05673(2017).