Interfacial Dzyaloshinskii-Moriya Interaction of Collinear Antiferromagnets MnPt and NiO on W, Re, and Au*

The interfacial Dzyaloshinskii-Moriya interaction (iDMI), which is found at the interface between a magnetic material and a heavy metal (HM), favors noncollinear spin configurations. The iDMI values have been calculated for the antiferromagnetic (AFM) materials MnPt and NiO in proximity with the heavy metals W, Re, and Au as a function of the thicknesses of both the AFM layer and the HM layer. The iDMI values of the MnPt-W and MnPt-Re heterolayers are comparable to those of the common ferromagnetic materials, and those of NiO-Au are approximately 7 times lower. The saturation magnetization, exchange stiffness, and magnetic anisotropy constants are also calculated as functions of layer thicknesses. These values will provide required input parameters for micromagnetic modelling of antiferromagnetic skyrmions.

Md. Rakibul Karim Akanda, In Jun Park, Roger K. Lake, arXiv:2007.11714.